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44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
#include <Storages/IStorage.h>
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#include <Storages/ColumnsDescription.h>
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#include <Storages/StorageValues.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <Processors/Pipe.h>
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namespace DB
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{
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StorageValues::StorageValues(
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const StorageID & table_id_,
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const ColumnsDescription & columns_,
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const Block & res_block_,
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const NamesAndTypesList & virtuals_)
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: IStorage(table_id_), res_block(res_block_), virtuals(virtuals_)
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{
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StorageInMemoryMetadata storage_metadata;
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storage_metadata.setColumns(columns_);
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setInMemoryMetadata(storage_metadata);
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}
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Pipe StorageValues::read(
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const Names & column_names,
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const StorageMetadataPtr & metadata_snapshot,
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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*/)
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{
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metadata_snapshot->check(column_names, getVirtuals(), getStorageID());
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/// Get only required columns.
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Block block;
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for (const auto & name : column_names)
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block.insert(res_block.getByName(name));
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Chunk chunk(block.getColumns(), block.rows());
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return Pipe(std::make_shared<SourceFromSingleChunk>(block.cloneEmpty(), std::move(chunk)));
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}
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}
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