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67 lines
2.0 KiB
C++
67 lines
2.0 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 StorageFromMergeTreeDataPart final : public ext::shared_ptr_helper<StorageFromMergeTreeDataPart>, public IStorage
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{
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friend struct ext::shared_ptr_helper<StorageFromMergeTreeDataPart>;
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public:
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String getName() const override { return "FromMergeTreeDataPart"; }
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Pipe read(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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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)
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.readFromParts({part}, column_names, metadata_snapshot, 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(
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const ASTPtr & left_in_operand, const Context & query_context, const StorageMetadataPtr & metadata_snapshot) const override
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{
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return part->storage.mayBenefitFromIndexForIn(left_in_operand, query_context, metadata_snapshot);
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}
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NamesAndTypesList getVirtuals() const override
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{
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return part->storage.getVirtuals();
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}
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protected:
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StorageFromMergeTreeDataPart(const MergeTreeData::DataPartPtr & part_)
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: IStorage(getIDFromPart(part_))
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, part(part_)
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{
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setInMemoryMetadata(part_->storage.getInMemoryMetadata());
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}
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private:
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MergeTreeData::DataPartPtr part;
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static StorageID getIDFromPart(const MergeTreeData::DataPartPtr & part_)
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{
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auto table_id = part_->storage.getStorageID();
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return StorageID(table_id.database_name, table_id.table_name + " (part " + part_->name + ")");
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}
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};
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}
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