////////////////////////////////////////////////////////////////////////////////
/// 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 "IResearchQueryCommon.h"

#include "IResearch/IResearchView.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/OperationOptions.h"
#include "Utils/SingleCollectionTransaction.h"
#include "VocBase/LogicalCollection.h"

#include <velocypack/Iterator.h>

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

namespace {

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

class IResearchQueryNullTermTest : public IResearchQueryTest {};

}  // namespace

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

TEST_F(IResearchQueryNullTermTest, test) {
  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, testDBInfo(server.server()));
  arangodb::LogicalView* view{};
  std::vector<arangodb::velocypack::Builder> insertedDocs;

  // create collection0
  {
    auto createJson = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testCollection0\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_NE(nullptr, collection);

    std::vector<std::shared_ptr<arangodb::velocypack::Builder>> docs{
        arangodb::velocypack::Parser::fromJson("{ \"seq\": -7 }"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": -6, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": -5, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": -4 }"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": -3, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": -2, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": -1 }"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": 0, \"value\": null }"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": 1 }")};

    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 = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testCollection1\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_NE(nullptr, collection);

    std::vector<std::shared_ptr<arangodb::velocypack::Builder>> docs{
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": 2, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": 3 }"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": 4 }"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": 5 }"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": 6, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson(
            "{ \"seq\": 7, \"value\": null}"),
        arangodb::velocypack::Parser::fromJson("{ \"seq\": 8 }")};

    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 view
  {
    auto createJson = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testView\", \"type\": \"arangosearch\" }");
    auto logicalView = vocbase.createView(createJson->slice());
    ASSERT_FALSE(!logicalView);

    view = logicalView.get();
    ASSERT_NE(nullptr, view);
    auto* impl = dynamic_cast<arangodb::iresearch::IResearchView*>(view);
    ASSERT_FALSE(!impl);

    auto updateJson = arangodb::velocypack::Parser::fromJson(
        "{ \"links\": {"
        "\"testCollection0\": { \"includeAllFields\": true, "
        "\"trackListPositions\": true },"
        "\"testCollection1\": { \"includeAllFields\": true }"
        "}}");
    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_EQ(2, cids.size());
    EXPECT_TRUE(
        (arangodb::tests::executeQuery(vocbase,
                                       "FOR d IN testView SEARCH 1 ==1 OPTIONS "
                                       "{ waitForSync: true } RETURN d")
             .result.ok()));  // commit
  }

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

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value == 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value == 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value == null, unordered
  {
    std::map<size_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");

      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }

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

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value == null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value == null, BM25(), TFIDF(), d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");

      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }

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

    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value == null SORT BM25(d), TFIDF(d), "
        "d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(expectedDocs.size(), resultIt.size());

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

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

  // invalid type
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const keySlice = docSlice.get("seq");
      auto const fieldSlice = docSlice.get("value");

      if (!fieldSlice.isNone() && "null" == arangodb::iresearch::getStringRef(fieldSlice)) {
        continue;
      }

      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value != 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // invalid type
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const keySlice = docSlice.get("seq");
      auto const fieldSlice = docSlice.get("value");

      if (!fieldSlice.isNone() &&
          (fieldSlice.isNumber() && 0. == fieldSlice.getNumber<double>())) {
        continue;
      }

      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value != 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value != null, unordered
  {
    std::map<size_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");

      if (!valueSlice.isNone() && valueSlice.isNull()) {
        continue;
      }

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

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value != null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value != null, BM25(), TFIDF(), d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");

      if (!valueSlice.isNone() && valueSlice.isNull()) {
        continue;
      }

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

    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value != null SORT BM25(d), TFIDF(d), "
        "d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(expectedDocs.size(), resultIt.size());

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

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

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value < 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value < false RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value < 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value < null
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

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

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value <= 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value <= false RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value <= 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value <= null, unordered
  {
    std::map<size_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value <= null, BM25(), TFIDF(), d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value <= null SORT BM25(d), TFIDF(d), "
        "d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(expectedDocs.size(), resultIt.size());

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

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

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value > 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value > false RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value > 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value > null
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value > null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

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

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value >= 'null' RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value >= 0 RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value >= false RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value >= null, unordered
  {
    std::map<size_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value >= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value >= null, BM25(), TFIDF(), d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value >= null SORT BM25(d), TFIDF(d), "
        "d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(expectedDocs.size(), resultIt.size());

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

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

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value > "
                                      "'null' and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value > 0 and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value > false and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // empty range
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value > null and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

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

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value >= "
                                      "'null' and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value >= 0 and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value >= "
                                      "false and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // empty range
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value >= null and d.value < null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

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

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value > "
                                      "'null' and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value > 0 and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value > "
                                      "false and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // empty range
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value > null and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

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

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value >= "
                                      "'null' and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value >= 0 and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // invalid type
  {
    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value >= "
                                      "false and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());

    for (auto const actualDoc : resultIt) {
      UNUSED(actualDoc);
      EXPECT_TRUE(false);
    }
  }

  // d.value >= null and d.value <= null, unordered
  {
    std::map<size_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult =
        arangodb::tests::executeQuery(vocbase,
                                      "FOR d IN testView SEARCH d.value >= "
                                      "null and d.value <= null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(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<ptrdiff_t>();

      auto expectedDoc = expectedDocs.find(key);
      ASSERT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value >= null and d.value <= null, BM25(), TFIDF(), d.seq DESC
  // (will be converted to d.value >= 0 AND d.value <= 0)
  {
    std::map<ptrdiff_t, arangodb::velocypack::Slice> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice = doc.slice().resolveExternals();
      auto const valueSlice = docSlice.get("value");
      if (valueSlice.isNone() || !valueSlice.isNull()) {
        continue;
      }
      auto const keySlice = docSlice.get("seq");
      expectedDocs.emplace(keySlice.getNumber<ptrdiff_t>(), docSlice);
    }

    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value >= null and d.value <= null SORT "
        "BM25(d), TFIDF(d), d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(expectedDocs.size(), resultIt.size());

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

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

  // d.value >= null and d.value <= null, unordered
  // (will be converted to d.value >= 0 AND d.value <= 0)
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.value IN null..null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());
    auto result = queryResult.data->slice();
    EXPECT_TRUE(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());
    EXPECT_FALSE(resultIt.valid());
  }

  // d.seq >= nullptr AND d.seq <= nullptr, unordered
  // (will be converted to d.seq >= 0 AND d.seq <= 0)
  {
    std::unordered_map<size_t, arangodb::velocypack::Slice> expectedDocs{
        {0, insertedDocs[7].slice()},  // seq == 0
    };

    auto queryResult = arangodb::tests::executeQuery(
        vocbase, "FOR d IN testView SEARCH d.seq IN null..null RETURN d");
    ASSERT_TRUE(queryResult.result.ok());

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

    arangodb::velocypack::ArrayIterator resultIt(result);
    ASSERT_EQ(expectedDocs.size(), resultIt.size());
    EXPECT_TRUE(resultIt.valid());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto key = resolved.get("seq");
      auto expectedDoc = expectedDocs.find(key.getNumber<size_t>());
      EXPECT_NE(expectedDoc, expectedDocs.end());
      EXPECT_TRUE(0 == arangodb::basics::VelocyPackHelper::compare(expectedDoc->second,
                                                                   resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    EXPECT_TRUE(expectedDocs.empty());
  }

  // d.value >= null and d.value <= null, BM25(), TFIDF(), d.seq DESC
  // (will be converted to d.value >= 0 AND d.value <= 0)
  {
    auto queryResult = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.value IN null..null SORT BM25(d), "
        "TFIDF(d), d.seq DESC RETURN d");
    ASSERT_TRUE(queryResult.result.ok());
    auto result = queryResult.data->slice();
    EXPECT_TRUE(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    EXPECT_EQ(0, resultIt.size());
    EXPECT_FALSE(resultIt.valid());
  }
}