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74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
#include <Storages/StorageDummy.h>
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#include <QueryPipeline/Pipe.h>
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#include <QueryPipeline/QueryPipelineBuilder.h>
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#include <Processors/Chunk.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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#include <Processors/QueryPlan/QueryPlan.h>
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namespace DB
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{
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StorageDummy::StorageDummy(
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const StorageID & table_id_, const ColumnsDescription & columns_, const StorageSnapshotPtr & original_storage_snapshot_)
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: IStorage(table_id_), original_storage_snapshot(original_storage_snapshot_)
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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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QueryProcessingStage::Enum StorageDummy::getQueryProcessingStage(
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ContextPtr,
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QueryProcessingStage::Enum,
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const StorageSnapshotPtr &,
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SelectQueryInfo &) const
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{
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return QueryProcessingStage::FetchColumns;
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}
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void StorageDummy::read(QueryPlan & query_plan,
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const Names & column_names,
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const StorageSnapshotPtr & storage_snapshot,
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SelectQueryInfo & query_info,
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ContextPtr local_context,
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QueryProcessingStage::Enum,
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size_t,
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size_t)
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{
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query_plan.addStep(std::make_unique<ReadFromDummy>(
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column_names,
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query_info,
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original_storage_snapshot ? original_storage_snapshot : storage_snapshot,
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local_context,
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*this));
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}
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ReadFromDummy::ReadFromDummy(
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const Names & column_names_,
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const SelectQueryInfo & query_info_,
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const StorageSnapshotPtr & storage_snapshot_,
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const ContextPtr & context_,
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const StorageDummy & storage_)
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: SourceStepWithFilter(
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DataStream{
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.header = SourceStepWithFilter::applyPrewhereActions(
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storage_snapshot_->getSampleBlockForColumns(column_names_), query_info_.prewhere_info)},
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column_names_,
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query_info_,
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storage_snapshot_,
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context_)
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, storage(storage_)
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, column_names(column_names_)
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{
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}
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void ReadFromDummy::initializePipeline(QueryPipelineBuilder & pipeline, const BuildQueryPipelineSettings &)
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{
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Pipe pipe(std::make_shared<SourceFromSingleChunk>(getOutputStream().header));
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pipeline.init(std::move(pipe));
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}
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}
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