////////////////////////////////////////////////////////////////////////////////
/// 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 "gtest/gtest.h"
#include "common.h"

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

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

#include "Basics/files.h"
#include "Cluster/ClusterFeature.h"
#include "V8/v8-globals.h"
#include "V8Server/V8DealerFeature.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/LogicalView.h"
#include "VocBase/ManagedDocumentResult.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/OperationOptions.h"
#include "Utils/SingleCollectionTransaction.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/FlushFeature.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
// -----------------------------------------------------------------------------

class IResearchQueryExistsTest : public ::testing::Test {
protected:
  StorageEngineMock engine;
  arangodb::application_features::ApplicationServer server;
  std::vector<std::pair<arangodb::application_features::ApplicationFeature*, bool>> features;

  IResearchQueryExistsTest(): 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::FlushFeature(server), false);
    features.emplace_back(new arangodb::SystemDatabaseFeature(server), true); // required by IResearchFilterFactory::extractAnalyzerFromArg(...) and IResearchAnalyzerFeature
    features.emplace_back(new arangodb::V8DealerFeature(server), false); // required for DatabaseFeature::createDatabase(...)
    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::ShardingFeature(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
    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::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

    // required for V8DealerFeature::prepare(), ClusterFeature::prepare() not required
    arangodb::application_features::ApplicationServer::server->addFeature(
      new arangodb::ClusterFeature(server)
    );

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

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

    auto const databases = VPackParser::fromJson(std::string("[ { \"name\": \"") + arangodb::StaticStrings::SystemDatabase + "\" } ]");
    auto* dbFeature = arangodb::application_features::ApplicationServer::lookupFeature<
      arangodb::DatabaseFeature
    >("Database");
    dbFeature->loadDatabases(databases->slice());

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

    auto* analyzers = arangodb::application_features::ApplicationServer::lookupFeature<
      arangodb::iresearch::IResearchAnalyzerFeature
    >();
    arangodb::iresearch::IResearchAnalyzerFeature::EmplaceResult result;
    TRI_vocbase_t* vocbase;

    dbFeature->createDatabase(1, "testVocbase", vocbase); // required for IResearchAnalyzerFeature::emplace(...)
    analyzers->emplace(
        result, "testVocbase::text_en", "text",
        VPackParser::fromJson("{ \"locale\": \"en.UTF-8\", \"stopwords\": [ ] }")->slice(), 
        { irs::frequency::type(), irs::norm::type(), irs::position::type() }); // cache analyzer

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

  ~IResearchQueryExistsTest() {
    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;

    // 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);
    arangodb::EngineSelectorFeature::ENGINE = nullptr;
  }
}; // IResearchQuerySetup

}

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

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

TEST_F(IResearchQueryExistsTest, test) {
  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
  std::vector<arangodb::velocypack::Builder> insertedDocs;
  arangodb::LogicalView* view;

  // create collection0
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testCollection0\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_TRUE((nullptr != collection));

    std::vector<std::shared_ptr<arangodb::velocypack::Builder>> docs {
      VPackParser::fromJson("{ \"seq\": -6, \"value\": null }"),
      VPackParser::fromJson("{ \"seq\": -5, \"value\": true }"),
      VPackParser::fromJson("{ \"seq\": -4, \"value\": \"abc\" }"),
      VPackParser::fromJson("{ \"seq\": -3, \"value\": 3.14 }"),
      VPackParser::fromJson("{ \"seq\": -2, \"value\": [ 1, \"abc\" ] }"),
      VPackParser::fromJson("{ \"seq\": -1, \"value\": { \"a\": 7, \"b\": \"c\" } }"),
    };

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      *collection,
      arangodb::AccessMode::Type::WRITE
    );
    EXPECT_TRUE((trx.begin().ok()));

    for (auto& entry: docs) {
      auto res = trx.insert(collection->name(), entry->slice(), options);
      EXPECT_TRUE((res.ok()));
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE((trx.commit().ok()));
  }

  // create collection1
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testCollection1\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_TRUE((nullptr != collection));

    irs::utf8_path resource;
    resource/=irs::string_ref(arangodb::tests::testResourceDir);
    resource/=irs::string_ref("simple_sequential.json");

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

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      *collection,
      arangodb::AccessMode::Type::WRITE
    );
    EXPECT_TRUE((trx.begin().ok()));

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto res = trx.insert(collection->name(), itr.value(), options);
      EXPECT_TRUE((res.ok()));
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE((trx.commit().ok()));
  }

  // create view
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testView\", \"type\": \"arangosearch\" }");
    auto logicalView = vocbase.createView(createJson->slice());
    ASSERT_TRUE((false == !logicalView));

    view = logicalView.get();
    auto* impl = dynamic_cast<arangodb::iresearch::IResearchView*>(view);
    ASSERT_TRUE((false == !impl));

    auto updateJson = VPackParser::fromJson(
      "{ \"links\": {"
        "\"testCollection0\": { \"includeAllFields\": true, \"trackListPositions\": true, \"storeValues\": \"id\"},"
        "\"testCollection1\": { \"includeAllFields\": true, \"storeValues\": \"id\" }"
      "}}"
    );
    EXPECT_TRUE((impl->properties(updateJson->slice(), true).ok()));
    std::set<TRI_voc_cid_t> cids;
    impl->visitCollections([&cids](TRI_voc_cid_t cid)->bool { cids.emplace(cid); return true; });
    EXPECT_TRUE((2 == cids.size()));
    EXPECT_TRUE((arangodb::tests::executeQuery(vocbase, "FOR d IN testView SEARCH 1 ==1 OPTIONS { waitForSync: true } RETURN d").result.ok())); // commit
  }

  // test non-existent (any)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.missing) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (any) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['missing']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (bool)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (bool) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (boolean)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (boolean) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (numeric)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (numeric) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (null)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (null) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (string)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.seq, 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (string) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['seq'], 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (text analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.seq, 'analyzer', 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (text analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.seq, 'analyzer'), 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (analyzer) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['seq'], 'analyzer'), 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (array)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value[2]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (array) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'][2]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (object)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value.d) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (object) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']['d']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[0].slice(),
      insertedDocs[1].slice(),
      insertedDocs[2].slice(),
      insertedDocs[3].slice(),
      insertedDocs[4].slice(),
      insertedDocs[5].slice(),
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[0].slice(),
      insertedDocs[1].slice(),
      insertedDocs[2].slice(),
      insertedDocs[3].slice(),
      insertedDocs[4].slice(),
      insertedDocs[5].slice(),
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (bool)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (bool) with bound params
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\" }")
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (bool) with bound view name
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN  @@testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\", \"@testView\": \"testView\" }")
    );

    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (bool) with invalid bound view name
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN  @@testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\", \"@testView\": \"invlaidViewName\" }")
    );

    ASSERT_TRUE(result.result.is(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND));
  }

  // test existent (bool) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (boolean)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (boolean) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[1].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (numeric)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[3].slice(),
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (numeric) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[3].slice(),
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (numeric) via [], limit  5
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[3].slice(),
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice()
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq LIMIT 5 RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (null)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[0].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (null) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[0].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (string)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.value, 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any string)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.value, 'string'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any string)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any string) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['value'], 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['value'], 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (identity analyzer) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[2].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (array)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[4].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value[1]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (array) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[4].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'][1]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (object)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[5].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value.b) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (object) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[5].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']['b']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }
}

TEST_F(IResearchQueryExistsTest, StoreMaskPartially) {
  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
  std::vector<arangodb::velocypack::Builder> insertedDocs;
  arangodb::LogicalView* view;

  // create collection0
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testCollection0\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_TRUE((nullptr != collection));

    std::vector<std::shared_ptr<arangodb::velocypack::Builder>> docs {
      VPackParser::fromJson("{ \"seq\": -6, \"value\": null }"),
      VPackParser::fromJson("{ \"seq\": -5, \"value\": true }"),
      VPackParser::fromJson("{ \"seq\": -4, \"value\": \"abc\" }"),
      VPackParser::fromJson("{ \"seq\": -3, \"value\": 3.14 }"),
      VPackParser::fromJson("{ \"seq\": -2, \"value\": [ 1, \"abc\" ] }"),
      VPackParser::fromJson("{ \"seq\": -1, \"value\": { \"a\": 7, \"b\": \"c\" } }"),
    };

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      *collection,
      arangodb::AccessMode::Type::WRITE
    );
    EXPECT_TRUE((trx.begin().ok()));

    for (auto& entry: docs) {
      auto res = trx.insert(collection->name(), entry->slice(), options);
      EXPECT_TRUE((res.ok()));
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE((trx.commit().ok()));
  }

  // create collection1
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testCollection1\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_TRUE((nullptr != collection));

    irs::utf8_path resource;
    resource/=irs::string_ref(arangodb::tests::testResourceDir);
    resource/=irs::string_ref("simple_sequential.json");

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

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      *collection,
      arangodb::AccessMode::Type::WRITE
    );
    EXPECT_TRUE((trx.begin().ok()));

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto res = trx.insert(collection->name(), itr.value(), options);
      EXPECT_TRUE((res.ok()));
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE((trx.commit().ok()));
  }

  // create view
  {
    auto createJson = VPackParser::fromJson("{ \"name\": \"testView\", \"type\": \"arangosearch\" }");
    auto logicalView = vocbase.createView(createJson->slice());
    ASSERT_TRUE((false == !logicalView));

    view = logicalView.get();
    auto* impl = dynamic_cast<arangodb::iresearch::IResearchView*>(view);
    ASSERT_TRUE((false == !impl));

    auto updateJson = VPackParser::fromJson(
      "{ \"links\": {"
        "\"testCollection0\": { \"includeAllFields\": true, \"trackListPositions\": true },"
        "\"testCollection1\": { \"includeAllFields\": true, \"storeValues\": \"id\" }"
      "}}"
    );
    EXPECT_TRUE((impl->properties(updateJson->slice(), true).ok()));
    std::set<TRI_voc_cid_t> cids;
    impl->visitCollections([&cids](TRI_voc_cid_t cid)->bool { cids.emplace(cid); return true; });
    EXPECT_TRUE((2 == cids.size()));
    EXPECT_TRUE((arangodb::tests::executeQuery(vocbase, "FOR d IN testView SEARCH 1 ==1 OPTIONS { waitForSync: true } RETURN d").result.ok())); // commit
  }

  // test non-existent (any)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.missing) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (any) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['missing']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (bool)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (bool) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (boolean)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (boolean) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (numeric)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (numeric) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (null)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.name, 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (null) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['name'], 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (string)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.seq, 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (string) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['seq'], 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (text analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.seq, 'analyzer', 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (text analyzer)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.seq, 'analyzer'), 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (analyzer) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['seq'], 'analyzer'), 'text_en') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (array)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value[2]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (array) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'][2]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (object)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value.d) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test non-existent (object) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']['d']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (any) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (bool)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (bool) with bound params
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\" }")
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (bool) with bound view name
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN  @@testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\", \"@testView\": \"testView\" }")
    );

    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (bool) with invalid bound view name
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN  @@testView SEARCH EXISTS(d.value, @type) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d",
      VPackParser::fromJson("{ \"type\" : \"bool\", \"@testView\": \"invlaidViewName\" }")
    );

    ASSERT_TRUE(result.result.is(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND));
  }

  // test existent (bool) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'bool') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (boolean)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (boolean) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'boolean') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (numeric)
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (numeric) via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
      insertedDocs[11].slice(),
      insertedDocs[12].slice(),
      insertedDocs[13].slice(),
      insertedDocs[14].slice(),
      insertedDocs[15].slice(),
      insertedDocs[16].slice(),
      insertedDocs[17].slice(),
      insertedDocs[18].slice(),
      insertedDocs[19].slice(),
      insertedDocs[20].slice(),
      insertedDocs[21].slice(),
      insertedDocs[22].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (numeric) via [], limit  5
  {
    std::vector<arangodb::velocypack::Slice> expected = {
      insertedDocs[6].slice(),
      insertedDocs[7].slice(),
      insertedDocs[8].slice(),
      insertedDocs[9].slice(),
      insertedDocs[10].slice(),
    };
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'numeric') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq LIMIT 5 RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE((i < expected.size()));
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++], resolved, true)));
    }

    EXPECT_TRUE((i == expected.size()));
  }

  // test existent (null)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (null) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'null') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (string)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.value, 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (any string)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d.value, 'string'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (any string)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (any string) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'string') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value, 'analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['value'], 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH ANALYZER(EXISTS(d['value'], 'analyzer'), 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (identity analyzer) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'], 'analyzer', 'identity') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (array)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value[1]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (array) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value'][1]) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (object)
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d.value.b) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }

  // test existent (object) via []
  {
    auto result = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH EXISTS(d['value']['b']) SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d"
    );
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    EXPECT_TRUE(0 == slice.length());
  }
}