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41 lines
1.1 KiB
C++
41 lines
1.1 KiB
C++
#pragma once
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#include <Processors/IAccumulatingTransform.h>
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#include <Interpreters/Aggregator.h>
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#include <Processors/Transforms/AggregatingTransform.h>
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namespace DB
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{
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/** A pre-aggregate stream of blocks in which each block is already aggregated.
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* Aggregate functions in blocks should not be finalized so that their states can be merged.
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*/
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class MergingAggregatedTransform : public IAccumulatingTransform
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{
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public:
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MergingAggregatedTransform(Block header, AggregatingTransformParamsPtr params, size_t max_threads);
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String getName() const override { return "MergingAggregatedTransform"; }
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protected:
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void consume(Chunk chunk) override;
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Chunk generate() override;
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private:
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AggregatingTransformParamsPtr params;
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Logger * log = &Logger::get("MergingAggregatedTransform");
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size_t max_threads;
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AggregatedDataVariants data_variants;
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Aggregator::BucketToBlocks bucket_to_blocks;
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UInt64 total_input_rows = 0;
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UInt64 total_input_blocks = 0;
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BlocksList blocks;
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BlocksList::iterator next_block;
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bool consume_started = false;
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bool generate_started = false;
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};
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}
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