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79592b73f8
Some cleanups
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
#pragma once
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#include <Storages/MergeTree/MergeTreeBaseSelectProcessor.h>
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namespace DB
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{
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class MergeTreeReadPool;
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/** Used in conjunction with MergeTreeReadPool, asking it for more work to do and performing whatever reads it is asked
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* to perform.
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*/
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class MergeTreeThreadSelectBlockInputProcessor : public MergeTreeBaseSelectProcessor
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{
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public:
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MergeTreeThreadSelectBlockInputProcessor(
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const size_t thread_,
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const std::shared_ptr<MergeTreeReadPool> & pool_,
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const size_t min_marks_to_read_,
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const UInt64 max_block_size_,
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size_t preferred_block_size_bytes_,
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size_t preferred_max_column_in_block_size_bytes_,
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const MergeTreeData & storage_,
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const StorageMetadataPtr & metadata_snapshot_,
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const bool use_uncompressed_cache_,
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const PrewhereInfoPtr & prewhere_info_,
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const MergeTreeReaderSettings & reader_settings_,
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const Names & virt_column_names_);
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String getName() const override { return "MergeTreeThread"; }
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~MergeTreeThreadSelectBlockInputProcessor() override;
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protected:
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/// Requests read task from MergeTreeReadPool and signals whether it got one
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bool getNewTask() override;
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private:
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/// "thread" index (there are N threads and each thread is assigned index in interval [0..N-1])
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size_t thread;
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std::shared_ptr<MergeTreeReadPool> pool;
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size_t min_marks_to_read;
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/// Last part read in this thread
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std::string last_readed_part_name;
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/// Names from header. Used in order to order columns in read blocks.
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Names ordered_names;
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};
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}
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