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76 lines
2.2 KiB
C++
76 lines
2.2 KiB
C++
#pragma once
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#include <DataStreams/IBlockInputStream.h>
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#include <Storages/MergeTree/MergeTreeThreadSelectBlockInputProcessor.h>
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#include <Storages/MergeTree/MergeTreeData.h>
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#include <Storages/MergeTree/MarkRange.h>
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#include <Storages/MergeTree/MergeTreeBlockReadUtils.h>
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#include <Storages/SelectQueryInfo.h>
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namespace DB
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{
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/// Used to read data from single part with select query
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/// Cares about PREWHERE, virtual columns, indexes etc.
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/// To read data from multiple parts, Storage (MergeTree) creates multiple such objects.
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class MergeTreeReverseSelectProcessor : public MergeTreeBaseSelectProcessor
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{
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public:
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MergeTreeReverseSelectProcessor(
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const MergeTreeData & storage,
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const MergeTreeData::DataPartPtr & owned_data_part,
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UInt64 max_block_size_rows,
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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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Names required_columns_,
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MarkRanges mark_ranges,
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bool use_uncompressed_cache,
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const PrewhereInfoPtr & prewhere_info,
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bool check_columns,
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const MergeTreeReaderSettings & reader_settings,
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const Names & virt_column_names = {},
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size_t part_index_in_query = 0,
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bool quiet = false);
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~MergeTreeReverseSelectProcessor() override;
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String getName() const override { return "MergeTreeReverse"; }
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/// Closes readers and unlock part locks
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void finish();
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protected:
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bool getNewTask() override;
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Chunk readFromPart() override;
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private:
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Block header;
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/// Used by Task
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Names required_columns;
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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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NameSet column_name_set;
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MergeTreeReadTaskColumns task_columns;
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/// Data part will not be removed if the pointer owns it
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MergeTreeData::DataPartPtr data_part;
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/// Mark ranges we should read (in ascending order)
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MarkRanges all_mark_ranges;
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/// Total number of marks we should read
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size_t total_marks_count = 0;
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/// Value of _part_index virtual column (used only in SelectExecutor)
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size_t part_index_in_query = 0;
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String path;
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Chunks chunks;
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Logger * log = &Logger::get("MergeTreeReverseSelectProcessor");
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};
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}
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