2015-06-24 11:03:53 +00:00
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#pragma once
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2019-10-01 16:50:08 +00:00
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#include <Storages/MergeTree/MergeTreeBaseSelectProcessor.h>
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2015-06-24 11:03:53 +00:00
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namespace DB
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{
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2016-11-20 12:43:20 +00:00
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class MergeTreeReadPool;
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2017-03-24 13:52:50 +00:00
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2015-09-09 17:39:28 +00:00
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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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2016-12-10 04:51:36 +00:00
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* to perform.
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*/
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2019-10-01 16:50:08 +00:00
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class MergeTreeThreadSelectBlockInputProcessor : public MergeTreeBaseSelectProcessor
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2015-06-24 11:03:53 +00:00
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{
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public:
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2019-10-01 16:50:08 +00:00
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MergeTreeThreadSelectBlockInputProcessor(
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2019-08-03 11:02:40 +00:00
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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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2020-06-16 14:25:08 +00:00
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const StorageMetadataPtr & metadata_snapshot_,
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2019-08-03 11:02:40 +00:00
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const bool use_uncompressed_cache_,
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const PrewhereInfoPtr & prewhere_info_,
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2019-12-18 15:54:45 +00:00
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const MergeTreeReaderSettings & reader_settings_,
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2019-08-03 11:02:40 +00:00
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const Names & virt_column_names_);
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2015-06-24 11:03:53 +00:00
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2017-04-01 07:20:54 +00:00
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String getName() const override { return "MergeTreeThread"; }
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2015-12-21 20:17:24 +00:00
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2019-10-01 16:50:08 +00:00
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~MergeTreeThreadSelectBlockInputProcessor() override;
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2018-01-09 01:51:08 +00:00
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2015-06-24 11:03:53 +00:00
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protected:
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2017-04-01 07:20:54 +00:00
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/// Requests read task from MergeTreeReadPool and signals whether it got one
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2017-04-05 20:34:19 +00:00
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bool getNewTask() override;
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2015-07-03 15:08:21 +00:00
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2018-04-16 12:21:36 +00:00
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private:
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2017-03-24 13:52:50 +00:00
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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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2015-07-03 15:08:21 +00:00
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2017-04-01 07:20:54 +00:00
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std::shared_ptr<MergeTreeReadPool> pool;
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2017-03-24 13:52:50 +00:00
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size_t min_marks_to_read;
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2018-04-16 12:21:36 +00:00
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2020-08-08 01:01:47 +00:00
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/// Last part read in this thread
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2020-04-14 19:47:19 +00:00
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std::string last_readed_part_name;
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2018-04-19 15:18:26 +00:00
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/// Names from header. Used in order to order columns in read blocks.
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2018-04-16 12:21:36 +00:00
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Names ordered_names;
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2015-06-24 11:03:53 +00:00
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};
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}
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