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55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
#pragma once
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#include <Storages/IStorage.h>
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#include <Storages/MergeTree/IMergeTreeDataPart.h>
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#include <Storages/MergeTree/MergeTreeDataSelectExecutor.h>
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#include <Core/Defines.h>
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#include <ext/shared_ptr_helper.h>
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namespace DB
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{
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/// A Storage that allows reading from a single MergeTree data part.
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class StorageFroIMergeTreeDataPart : public ext::shared_ptr_helper<StorageFroIMergeTreeDataPart>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageFroIMergeTreeDataPart>;
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public:
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String getName() const override { return "FroIMergeTreeDataPart"; }
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String getTableName() const override { return part->storage.getTableName() + " (part " + part->name + ")"; }
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String getDatabaseName() const override { return part->storage.getDatabaseName(); }
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BlockInputStreams read(
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const Names & column_names,
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const SelectQueryInfo & query_info,
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const Context & context,
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QueryProcessingStage::Enum /*processed_stage*/,
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size_t max_block_size,
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unsigned num_streams) override
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{
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return MergeTreeDataSelectExecutor(part->storage).readFromParts(
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{part}, column_names, query_info, context, max_block_size, num_streams);
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}
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bool supportsIndexForIn() const override { return true; }
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bool mayBenefitFromIndexForIn(const ASTPtr & left_in_operand, const Context & query_context) const override
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{
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return part->storage.mayBenefitFromIndexForIn(left_in_operand, query_context);
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}
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protected:
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StorageFroIMergeTreeDataPart(const MergeTreeData::DataPartPtr & part_)
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: IStorage(part_->storage.getVirtuals()), part(part_)
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{
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setColumns(part_->storage.getColumns());
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setIndices(part_->storage.getIndices());
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}
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private:
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MergeTreeData::DataPartPtr part;
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};
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}
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