ClickHouse/src/Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.h

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#pragma once
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#include <Storages/MergeTree/MergeTreeBaseSelectProcessor.h>
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namespace DB
{
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class MergeTreeReadPool;
/** Used in conjunction with MergeTreeReadPool, asking it for more work to do and performing whatever reads it is asked
* to perform.
*/
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class MergeTreeThreadSelectBlockInputProcessor : public MergeTreeBaseSelectProcessor
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{
public:
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MergeTreeThreadSelectBlockInputProcessor(
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const size_t thread_,
const std::shared_ptr<MergeTreeReadPool> & pool_,
const size_t min_marks_to_read_,
const UInt64 max_block_size_,
size_t preferred_block_size_bytes_,
size_t preferred_max_column_in_block_size_bytes_,
const MergeTreeData & storage_,
const bool use_uncompressed_cache_,
const PrewhereInfoPtr & prewhere_info_,
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:
/// Requests read task from MergeTreeReadPool and signals whether it got one
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bool getNewTask() override;
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private:
/// "thread" index (there are N threads and each thread is assigned index in interval [0..N-1])
size_t thread;
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std::shared_ptr<MergeTreeReadPool> pool;
size_t min_marks_to_read;
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/// Last part readed in this thread
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std::string last_readed_part_path;
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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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};
}