////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2017 ArangoDB GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
///     http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Andrey Abramov
/// @author Vasiliy Nabatchikov
////////////////////////////////////////////////////////////////////////////////

#include "catch.hpp"
#include "common.h"

#include "../Mocks/StorageEngineMock.h"

#if USE_ENTERPRISE
  #include "Enterprise/Ldap/LdapFeature.h"
#endif

#include "V8/v8-globals.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/LogicalView.h"
#include "VocBase/ManagedDocumentResult.h"
#include "Transaction/Methods.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/OperationOptions.h"
#include "Aql/AqlFunctionFeature.h"
#include "Aql/OptimizerRulesFeature.h"
#include "GeneralServer/AuthenticationFeature.h"
#include "IResearch/IResearchCommon.h"
#include "IResearch/IResearchFeature.h"
#include "IResearch/IResearchFilterFactory.h"
#include "IResearch/IResearchView.h"
#include "IResearch/IResearchAnalyzerFeature.h"
#include "Logger/Logger.h"
#include "Logger/LogTopic.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "RestServer/DatabasePathFeature.h"
#include "RestServer/ViewTypesFeature.h"
#include "RestServer/AqlFeature.h"
#include "RestServer/DatabaseFeature.h"
#include "RestServer/QueryRegistryFeature.h"
#include "RestServer/SystemDatabaseFeature.h"
#include "RestServer/TraverserEngineRegistryFeature.h"
#include "Sharding/ShardingFeature.h"
#include "Basics/VelocyPackHelper.h"
#include "Aql/Ast.h"
#include "Aql/Query.h"
#include "3rdParty/iresearch/tests/tests_config.hpp"

#include "IResearch/VelocyPackHelper.h"
#include "analysis/analyzers.hpp"
#include "analysis/token_attributes.hpp"
#include "utils/utf8_path.hpp"

#include <velocypack/Iterator.h>

extern const char* ARGV0; // defined in main.cpp

namespace {

// -----------------------------------------------------------------------------
// --SECTION--                                                 setup / tear-down
// -----------------------------------------------------------------------------

struct IResearchQueryNumericTermSetup {
  StorageEngineMock engine;
  arangodb::application_features::ApplicationServer server;
  std::unique_ptr<TRI_vocbase_t> system;
  std::vector<std::pair<arangodb::application_features::ApplicationFeature*, bool>> features;

  IResearchQueryNumericTermSetup(): engine(server), server(nullptr, nullptr) {
    arangodb::EngineSelectorFeature::ENGINE = &engine;

    arangodb::tests::init(true);

    // suppress INFO {authentication} Authentication is turned on (system only), authentication for unix sockets is turned on
    // suppress WARNING {authentication} --server.jwt-secret is insecure. Use --server.jwt-secret-keyfile instead
    arangodb::LogTopic::setLogLevel(arangodb::Logger::AUTHENTICATION.name(), arangodb::LogLevel::ERR);

    // suppress log messages since tests check error conditions
    arangodb::LogTopic::setLogLevel(arangodb::Logger::AQL.name(), arangodb::LogLevel::ERR); // suppress WARNING {aql} Suboptimal AqlItemMatrix index lookup:
    arangodb::LogTopic::setLogLevel(arangodb::Logger::FIXME.name(), arangodb::LogLevel::ERR); // suppress WARNING DefaultCustomTypeHandler called
    arangodb::LogTopic::setLogLevel(arangodb::iresearch::TOPIC.name(), arangodb::LogLevel::FATAL);
    irs::logger::output_le(iresearch::logger::IRL_FATAL, stderr);

    // setup required application features
    features.emplace_back(new arangodb::ViewTypesFeature(server), true);
    features.emplace_back(new arangodb::AuthenticationFeature(server), true);
    features.emplace_back(new arangodb::DatabasePathFeature(server), false);
    features.emplace_back(new arangodb::DatabaseFeature(server), false);
    features.emplace_back(new arangodb::QueryRegistryFeature(server), false); // must be first
    arangodb::application_features::ApplicationServer::server->addFeature(features.back().first); // need QueryRegistryFeature feature to be added now in order to create the system database
    system = irs::memory::make_unique<TRI_vocbase_t>(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 0, TRI_VOC_SYSTEM_DATABASE);
    features.emplace_back(new arangodb::SystemDatabaseFeature(server, system.get()), false); // required for IResearchAnalyzerFeature
    features.emplace_back(new arangodb::TraverserEngineRegistryFeature(server), false); // must be before AqlFeature
    features.emplace_back(new arangodb::AqlFeature(server), true);
    features.emplace_back(new arangodb::aql::OptimizerRulesFeature(server), true);
    features.emplace_back(new arangodb::aql::AqlFunctionFeature(server), true); // required for IResearchAnalyzerFeature
    features.emplace_back(new arangodb::ShardingFeature(server), false);
    features.emplace_back(new arangodb::iresearch::IResearchAnalyzerFeature(server), true);
    features.emplace_back(new arangodb::iresearch::IResearchFeature(server), true);

    #if USE_ENTERPRISE
      features.emplace_back(new arangodb::LdapFeature(server), false); // required for AuthenticationFeature with USE_ENTERPRISE
    #endif

    for (auto& f : features) {
      arangodb::application_features::ApplicationServer::server->addFeature(f.first);
    }

    for (auto& f : features) {
      f.first->prepare();
    }

    for (auto& f : features) {
      if (f.second) {
        f.first->start();
      }
    }

    auto* dbPathFeature = arangodb::application_features::ApplicationServer::getFeature<arangodb::DatabasePathFeature>("DatabasePath");
    arangodb::tests::setDatabasePath(*dbPathFeature); // ensure test data is stored in a unique directory
  }

  ~IResearchQueryNumericTermSetup() {
    system.reset(); // destroy before reseting the 'ENGINE'
    arangodb::AqlFeature(server).stop(); // unset singleton instance
    arangodb::LogTopic::setLogLevel(arangodb::iresearch::TOPIC.name(), arangodb::LogLevel::DEFAULT);
    arangodb::LogTopic::setLogLevel(arangodb::Logger::FIXME.name(), arangodb::LogLevel::DEFAULT);
    arangodb::LogTopic::setLogLevel(arangodb::Logger::AQL.name(), arangodb::LogLevel::DEFAULT);
    arangodb::application_features::ApplicationServer::server = nullptr;
    arangodb::EngineSelectorFeature::ENGINE = nullptr;

    // destroy application features
    for (auto& f : features) {
      if (f.second) {
        f.first->stop();
      }
    }

    for (auto& f : features) {
      f.first->unprepare();
    }

    arangodb::LogTopic::setLogLevel(arangodb::Logger::AUTHENTICATION.name(), arangodb::LogLevel::DEFAULT);
  }
}; // IResearchQuerySetup

}

// -----------------------------------------------------------------------------
// --SECTION--                                                        test suite
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief setup
////////////////////////////////////////////////////////////////////////////////

TEST_CASE("IResearchQueryTestNumericTerm", "[iresearch][iresearch-query]") {
  IResearchQueryNumericTermSetup s;
  UNUSED(s);

  // ArangoDB specific string comparer
  struct StringComparer {
    bool operator()(irs::string_ref const& lhs, irs::string_ref const& rhs) const {
      return arangodb::basics::VelocyPackHelper::compareStringValues(
        lhs.c_str(), lhs.size(), rhs.c_str(), rhs.size(), true
      ) < 0;
    }
  }; // StringComparer

  static std::vector<std::string> const EMPTY;

  auto createJson = arangodb::velocypack::Parser::fromJson("{ \
    \"name\": \"testView\", \
    \"type\": \"arangosearch\" \
  }");

  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
  std::shared_ptr<arangodb::LogicalCollection> logicalCollection1;
  std::shared_ptr<arangodb::LogicalCollection> logicalCollection2;

  // add collection_1
  {
    auto collectionJson = arangodb::velocypack::Parser::fromJson("{ \"name\": \"collection_1\" }");
    logicalCollection1 = vocbase.createCollection(collectionJson->slice());
    REQUIRE((nullptr != logicalCollection1));
  }

  // add collection_2
  {
    auto collectionJson = arangodb::velocypack::Parser::fromJson("{ \"name\": \"collection_2\" }");
    logicalCollection2 = vocbase.createCollection(collectionJson->slice());
    REQUIRE((nullptr != logicalCollection2));
  }

  // add view
  auto view = std::dynamic_pointer_cast<arangodb::iresearch::IResearchView>(
    vocbase.createView(createJson->slice())
  );
  REQUIRE((false == !view));

  // add link to collection
  {
    auto updateJson = arangodb::velocypack::Parser::fromJson(
      "{ \"links\" : {"
        "\"collection_1\" : { \"includeAllFields\" : true },"
        "\"collection_2\" : { \"includeAllFields\" : true }"
      "}}"
    );
    CHECK((view->properties(updateJson->slice(), true).ok()));

    arangodb::velocypack::Builder builder;

    builder.openObject();
    view->properties(builder, true, false);
    builder.close();

    auto slice = builder.slice();
    CHECK(slice.isObject());
    CHECK(slice.get("name").copyString() == "testView");
    CHECK(slice.get("type").copyString() == arangodb::iresearch::DATA_SOURCE_TYPE.name());
    CHECK(slice.get("deleted").isNone()); // no system properties
    auto tmpSlice = slice.get("links");
    CHECK((true == tmpSlice.isObject() && 2 == tmpSlice.length()));
  }

  std::deque<arangodb::ManagedDocumentResult> insertedDocs;

  // populate view with the data
  {
    arangodb::OperationOptions opt;
    TRI_voc_tick_t tick;

    arangodb::transaction::Methods trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      EMPTY, EMPTY, EMPTY,
      arangodb::transaction::Options()
    );
    CHECK((trx.begin().ok()));

    // insert into collections
    {
      irs::utf8_path resource;
      resource/=irs::string_ref(IResearch_test_resource_dir);
      resource/=irs::string_ref("simple_sequential.json");

      auto builder = arangodb::basics::VelocyPackHelper::velocyPackFromFile(resource.utf8());
      auto root = builder.slice();
      REQUIRE(root.isArray());

      size_t i = 0;

      std::shared_ptr<arangodb::LogicalCollection> collections[] {
        logicalCollection1, logicalCollection2
      };

      for (auto doc : arangodb::velocypack::ArrayIterator(root)) {
        insertedDocs.emplace_back();
        auto const res = collections[i % 2]->insert(&trx, doc, insertedDocs.back(), opt, false);
        CHECK(res.ok());
        ++i;
      }
    }

    CHECK((trx.commit().ok()));
    CHECK((TRI_ERROR_NO_ERROR == arangodb::tests::executeQuery(vocbase, "FOR d IN testView SEARCH 1 ==1 OPTIONS { waitForSync: true } RETURN d").code)); // commit
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                ==
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == true RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == null RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // missing term
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == -1 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.value == 90.564, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs {
      { 12, &insertedDocs[12] }
    };

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value == 90.564 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.value == -32.5, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs {
      { 16, &insertedDocs[16] }
    };

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value == -32.5 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq == 2, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs {
      { 2, &insertedDocs[2] }
    };

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == 2 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq == 2.0, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs {
      { 2, &insertedDocs[2] }
    };

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq == 2.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.value == 100.0, TFIDF() ASC, BM25() ASC, d.seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<ptrdiff_t>();
      if (value != 100) {
        continue;
      }
      expectedDocs.emplace(keySlice.getNumber<size_t>(), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH 100.0 == d.value SORT BM25(d) ASC, TFIDF(d) ASC, d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                !=
  // -----------------------------------------------------------------------------

  // invalid type, unordered
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("name");
      expectedDocs.emplace(arangodb::iresearch::getStringRef(keySlice), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq != '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("name");
      auto const key = arangodb::iresearch::getStringRef(keySlice);

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // invalid type, unordered
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("name");
      expectedDocs.emplace(arangodb::iresearch::getStringRef(keySlice), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq != false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("name");
      auto const key = arangodb::iresearch::getStringRef(keySlice);

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // invalid type, d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq != null SORT d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();

      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // missing term, unordered
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("name");
      expectedDocs.emplace(arangodb::iresearch::getStringRef(keySlice), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq != -1 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("name");
      auto const key = arangodb::iresearch::getStringRef(keySlice);

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // existing duplicated term, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      auto const valueSlice = docSlice.get("value");

      if (!valueSlice.isNone() && valueSlice.getNumber<ptrdiff_t>() == 100) {
        continue;
      }

      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value != 100 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // existing unique term, unordered
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("name");
      expectedDocs.emplace(arangodb::iresearch::getStringRef(keySlice), &doc);
    }
    expectedDocs.erase("C");

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq != 2.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("name");
      auto const key = arangodb::iresearch::getStringRef(keySlice);

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // missing term, seq DESC
  {
    std::vector<arangodb::ManagedDocumentResult const*> expectedDocs;

    for (auto const& doc: insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const fieldSlice = docSlice.get("value");

      if (!fieldSlice.isNone() && (fieldSlice.isNumber() && -1. == fieldSlice.getNumber<double>())) {
        continue;
      }

      expectedDocs.emplace_back(&doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value != -1 SORT d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice((*expectedDoc)->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // existing duplicated term, TFIDF() ASC, BM25() ASC, seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");

      if (!valueSlice.isNone() && 123 == valueSlice.getNumber<ptrdiff_t>()) {
        continue;
      }

      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<size_t>(), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH 123 != d.value SORT TFIDF(d) ASC, BM25(d) ASC, d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(resultIt.size() == expectedDocs.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                 <
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < true RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < null RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq < 7, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key >= 7) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq < 0 (less than min term), unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < 0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq < 31 (less than max term), BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key >= 31) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq < 31 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value < 0, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() >= 0) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value < 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value < 95, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() >= 95) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value < 95 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                <=
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= true RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= null RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq <= 7, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key > 7) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq <= 0 (less or equal than min term), unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= 0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(1 == resultIt.size());
    CHECK(resultIt.valid());

    auto const resolved = resultIt.value().resolveExternals();
    CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(insertedDocs[0].vpack()), resolved, true));

    resultIt.next();
    CHECK(!resultIt.valid());
  }

  // d.seq <= 31 (less or equal than max term), BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key > 31) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq <= 31 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value <= 0, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() > 0) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value <= 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value <= 95, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() > 95) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value <= 95 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                 >
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > true RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > null RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 7, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 31 (greater than max term), unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 31 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 0 (less or equal than min term), BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 0) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > 0, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() <= 0) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > 95, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() <= 95) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > 95 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                                >=
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= '0' RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= true RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= false RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= null RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key < 7) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 31 (greater than max term), unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 31 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(1 == resultIt.size());
    CHECK(resultIt.valid());

    auto const resolved = resultIt.value().resolveExternals();
    CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(insertedDocs[31].vpack()), resolved, true));

    resultIt.next();
    CHECK(!resultIt.valid());
  }

  // d.seq >= 0 (less or equal than min term), BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= 0, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() < 0) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= 0 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > 95, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || valueSlice.getNumber<ptrdiff_t>() < 95) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= 95 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                      Range (>, <)
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > '0' AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > true AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > false AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > null AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 7 AND d.name < 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7 AND d.seq < 18 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 7 AND d.seq < 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7.1 AND d.seq < 17.9 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 18 AND d.seq < 7 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 18 AND d.seq < 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 7 AND d.seq < 7.0 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7 AND d.seq < 7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 0 AND d.seq < 31 , TFIDF() ASC, BM25() ASC, d.name DESC
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*, StringComparer> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 0 || key >= 31) {
        continue;
      }
      expectedDocs.emplace(arangodb::iresearch::getStringRef(docSlice.get("name")), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 0 AND d.seq < 31 SORT tfidf(d), BM25(d), d.name DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > 90.564 AND d.value < 300, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value <= 90.564 || value >= 300) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > 90.564 AND d.value < 300 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > -32.5 AND d.value < 50, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value <= -32.5 || value >= 50) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > -32.5 AND d.value < 50 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                     Range (>=, <)
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= '0' AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= true AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= false AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= null AND d.seq < 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7 AND d.seq < 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key < 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7 AND d.seq < 18 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 7.1 AND d.seq <= 17.9, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7.1 AND d.seq <= 17.9 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 18 AND d.seq < 7 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 18 AND d.seq < 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7 AND d.seq < 7.0 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7 AND d.seq < 7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 0 AND d.seq < 31 , TFIDF() ASC, BM25() ASC, d.name DESC
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*, StringComparer> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key >= 31) {
        continue;
      }
      expectedDocs.emplace(arangodb::iresearch::getStringRef(docSlice.get("name")), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 0 AND d.seq < 31 SORT tfidf(d), BM25(d), d.name DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= 90.564 AND d.value < 300, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < 90.564 || value >= 300) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= 90.564 AND d.value < 300 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= -32.5 AND d.value < 50, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < -32.5 || value >= 50) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= -32.5 AND d.value < 50 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                     Range (>, <=)
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > '0' AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > true AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > false AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > null AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 7 AND d.seq <= 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key > 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7 AND d.seq <= 18 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 7 AND d.seq <= 17.9, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7.1 AND d.seq <= 17.9 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq > 18 AND d.seq <= 7 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 18 AND d.seq <= 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 7 AND d.seq <= 7.0 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 7 AND d.seq <= 7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq > 0 AND d.seq <= 31 , TFIDF() ASC, BM25() ASC, d.name DESC
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*, StringComparer> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 0 || key > 31) {
        continue;
      }
      expectedDocs.emplace(arangodb::iresearch::getStringRef(docSlice.get("name")), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq > 0 AND d.seq <= 31 SORT tfidf(d), BM25(d), d.name DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > 90.564 AND d.value <= 300, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value <= 90.564 || value > 300) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > 90.564 AND d.value <= 300 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value > -32.5 AND d.value <= 50, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value <= -32.5 || value > 50) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value > -32.5 AND d.value <= 50 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                    Range (>=, <=)
  // -----------------------------------------------------------------------------

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= '0' AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= true AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= false AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= null AND d.seq <= 15 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7 AND d.seq <= 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key < 7 || key > 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7 AND d.seq <= 18 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 7.1 AND d.seq <= 17.9, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 7 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7.1 AND d.seq <= 17.9 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 18 AND d.seq <= 7 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 18 AND d.seq <= 7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7.0 AND d.seq <= 7.0 , unordered
  // will be optimized to d.seq == 7.0
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7.0 AND d.seq <= 7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(1 == resultIt.size());

    auto const resolved = resultIt.value().resolveExternals();
    CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(insertedDocs[7].vpack()), resolved, true));

    resultIt.next();
    CHECK(!resultIt.valid());
  }

  // d.seq > 7 AND d.seq <= 7.0 , unordered
  // behavior same as above
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 7 AND d.seq <= 7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(1 == resultIt.size());

    auto const resolved = resultIt.value().resolveExternals();
    CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(insertedDocs[7].vpack()), resolved, true));

    resultIt.next();
    CHECK(!resultIt.valid());
  }

  // d.seq >= 0 AND d.seq <= 31 , TFIDF() ASC, BM25() ASC, d.name DESC
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*, StringComparer> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key > 31) {
        continue;
      }
      expectedDocs.emplace(arangodb::iresearch::getStringRef(docSlice.get("name")), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq >= 0 AND d.seq <= 31 SORT tfidf(d), BM25(d), d.name DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= 90.564 AND d.value <= 300, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < 90.564 || value > 300) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= 90.564 AND d.value <= 300 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= -32.5 AND d.value <= 50, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < -32.5 || value > 50) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value >= -32.5 AND d.value <= 50 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // -----------------------------------------------------------------------------
  // --SECTION--                                                    Range (>=, <=)
  // -----------------------------------------------------------------------------

  // d.seq >= 7 AND d.seq <= 18, unordered
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key < 7 || key > 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq IN 7..18 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 7.1 AND d.seq <= 17.9, unordered
  // (will be converted to d.seq >= 7 AND d.seq <= 17)
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key <= 6 || key >= 18) {
        continue;
      }
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq IN 7.1..17.9 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    REQUIRE(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("seq");
      auto const key = keySlice.getNumber<size_t>();

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.seq >= 18 AND d.seq <= 7 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq IN 18..7 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // d.seq >= 7 AND d.seq <= 7.0 , unordered
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq IN 7..7.0 RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(1 == resultIt.size());

    auto const resolved = resultIt.value().resolveExternals();
    CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(insertedDocs[7].vpack()), resolved, true));

    resultIt.next();
    CHECK(!resultIt.valid());
  }

  // d.seq >= 0 AND d.seq <= 31 , TFIDF() ASC, BM25() ASC, d.name DESC
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*, StringComparer> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      if (key > 31) {
        continue;
      }
      expectedDocs.emplace(arangodb::iresearch::getStringRef(docSlice.get("name")), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.seq IN 0..31 SORT tfidf(d), BM25(d), d.name DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= 90.564 AND d.value <= 300, BM25() ASC, TFIDF() ASC seq DESC
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < 90.564 || value > 300) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value IN 90.564..300 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // d.value >= -32.5 AND d.value <= 50, BM25() ASC, TFIDF() ASC seq DESC
  // (will be converted to d.value >= -32 AND d.value <= 50)
  {
    std::map<size_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone()) {
        continue;
      }
      auto const value = valueSlice.getNumber<double>();
      if (value < -32 || value > 50) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      auto const key = keySlice.getNumber<size_t>();
      expectedDocs.emplace(key, &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH d.value IN -32.5..50 SORT BM25(d), TFIDF(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    REQUIRE(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }
}

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------