2021-04-26 09:40:54 +00:00
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#include <Storages/MergeTree/MergeTreeIndexHypothesis.h>
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#include <Interpreters/ExpressionActions.h>
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#include <Interpreters/ExpressionAnalyzer.h>
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#include <Interpreters/TreeRewriter.h>
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#include <Parsers/ASTIdentifier.h>
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#include <Parsers/ASTFunction.h>
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#include <Parsers/ASTLiteral.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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extern const int LOGICAL_ERROR;
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}
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MergeTreeIndexGranuleHypothesis::MergeTreeIndexGranuleHypothesis(const String & index_name_)
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: index_name(index_name_), is_empty(true), met(false)
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{
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}
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MergeTreeIndexGranuleHypothesis::MergeTreeIndexGranuleHypothesis(const String & index_name_, const bool met_)
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: index_name(index_name_), is_empty(false), met(met_)
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{
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}
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void MergeTreeIndexGranuleHypothesis::serializeBinary(WriteBuffer & ostr) const
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{
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const auto & size_type = DataTypePtr(std::make_shared<DataTypeUInt8>());
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2021-04-27 10:57:59 +00:00
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size_type->getDefaultSerialization()->serializeBinary(static_cast<UInt8>(met), ostr);
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2021-04-26 09:40:54 +00:00
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}
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2021-11-10 16:35:28 +00:00
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void MergeTreeIndexGranuleHypothesis::deserializeBinary(ReadBuffer & istr, MergeTreeIndexVersion version)
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2021-04-26 09:40:54 +00:00
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{
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2021-11-10 16:35:28 +00:00
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if (version != 1)
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throw Exception(ErrorCodes::LOGICAL_ERROR, "Unknown index version {}.", version);
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2021-04-26 09:40:54 +00:00
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Field field_met;
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const auto & size_type = DataTypePtr(std::make_shared<DataTypeUInt8>());
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2021-04-27 10:57:59 +00:00
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size_type->getDefaultSerialization()->deserializeBinary(field_met, istr);
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2021-04-26 09:40:54 +00:00
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met = field_met.get<UInt8>();
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is_empty = false;
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}
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MergeTreeIndexAggregatorHypothesis::MergeTreeIndexAggregatorHypothesis(const String & index_name_, const String & column_name_)
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: index_name(index_name_), column_name(column_name_)
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{
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}
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MergeTreeIndexGranulePtr MergeTreeIndexAggregatorHypothesis::getGranuleAndReset()
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{
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const auto granule = std::make_shared<MergeTreeIndexGranuleHypothesis>(index_name, met);
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met = true;
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is_empty = true;
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return granule;
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}
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void MergeTreeIndexAggregatorHypothesis::update(const Block & block, size_t * pos, size_t limit)
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{
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size_t rows_read = std::min(limit, block.rows() - *pos);
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if (rows_read == 0)
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return;
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const auto & column = block.getByName(column_name).column->cut(*pos, rows_read);
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if (!column->hasEqualValues() || column->get64(0) == 0)
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met = false;
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is_empty = false;
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*pos += rows_read;
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}
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MergeTreeIndexGranulePtr MergeTreeIndexHypothesis::createIndexGranule() const
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{
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return std::make_shared<MergeTreeIndexGranuleHypothesis>(index.name);
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}
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MergeTreeIndexAggregatorPtr MergeTreeIndexHypothesis::createIndexAggregator() const
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{
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return std::make_shared<MergeTreeIndexAggregatorHypothesis>(index.name, index.sample_block.getNames().front());
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}
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MergeTreeIndexConditionPtr MergeTreeIndexHypothesis::createIndexCondition(
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const SelectQueryInfo &, ContextPtr) const
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{
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2021-05-04 18:43:58 +00:00
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throw Exception("Not supported", ErrorCodes::LOGICAL_ERROR);
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2021-04-26 09:40:54 +00:00
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}
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bool MergeTreeIndexHypothesis::mayBenefitFromIndexForIn(const ASTPtr &) const
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{
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return false;
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}
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MergeTreeIndexPtr hypothesisIndexCreator(const IndexDescription & index)
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{
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return std::make_shared<MergeTreeIndexHypothesis>(index);
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}
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2021-05-02 19:16:40 +00:00
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void hypothesisIndexValidator(const IndexDescription & index, bool /*attach*/)
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{
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if (index.expression_list_ast->children.size() != 1)
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throw Exception("Hypothesis index needs exactly one expression", ErrorCodes::LOGICAL_ERROR);
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2021-04-26 09:40:54 +00:00
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}
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}
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