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109 lines
3.9 KiB
C++
109 lines
3.9 KiB
C++
#pragma once
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#include <shared_mutex>
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#include <Common/LRUCache.h>
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#include <Core/Block.h>
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#include <Core/SortDescription.h>
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#include <Interpreters/IJoin.h>
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#include <Interpreters/SortedBlocksWriter.h>
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#include <DataStreams/SizeLimits.h>
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namespace DB
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{
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class TableJoin;
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class MergeJoinCursor;
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struct MergeJoinEqualRange;
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class MergeJoin : public IJoin
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{
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public:
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MergeJoin(std::shared_ptr<TableJoin> table_join_, const Block & right_sample_block);
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bool addJoinedBlock(const Block & block, bool check_limits) override;
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void joinBlock(Block &, ExtraBlockPtr & not_processed) override;
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void joinTotals(Block &) const override;
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void setTotals(const Block &) override;
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bool hasTotals() const override { return totals; }
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size_t getTotalRowCount() const override { return right_blocks.row_count; }
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size_t getTotalByteCount() const override { return right_blocks.bytes; }
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private:
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struct NotProcessed : public ExtraBlock
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{
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size_t left_position;
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size_t right_position;
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size_t right_block;
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};
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/// There're two size limits for right-hand table: max_rows_in_join, max_bytes_in_join.
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/// max_bytes is prefered. If it isn't set we approximate it as (max_rows * bytes/row).
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struct BlockByteWeight
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{
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size_t operator()(const Block & block) const { return block.bytes(); }
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};
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using Cache = LRUCache<size_t, Block, std::hash<size_t>, BlockByteWeight>;
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mutable std::shared_mutex rwlock;
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std::shared_ptr<TableJoin> table_join;
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SizeLimits size_limits;
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SortDescription left_sort_description;
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SortDescription right_sort_description;
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SortDescription left_merge_description;
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SortDescription right_merge_description;
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Block right_sample_block;
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Block right_table_keys;
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Block right_columns_to_add;
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SortedBlocksWriter::Blocks right_blocks;
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Blocks min_max_right_blocks;
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std::unique_ptr<Cache> cached_right_blocks;
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std::vector<std::shared_ptr<Block>> loaded_right_blocks;
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std::unique_ptr<SortedBlocksWriter> disk_writer;
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SortedBlocksWriter::SortedFiles flushed_right_blocks;
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Block totals;
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std::atomic<bool> is_in_memory{true};
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const bool nullable_right_side;
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const bool is_any_join;
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const bool is_all_join;
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const bool is_semi_join;
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const bool is_inner;
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const bool is_left;
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const bool skip_not_intersected;
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const size_t max_joined_block_rows;
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const size_t max_rows_in_right_block;
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const size_t max_files_to_merge;
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void changeLeftColumns(Block & block, MutableColumns && columns) const;
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void addRightColumns(Block & block, MutableColumns && columns);
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template <bool is_all>
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ExtraBlockPtr extraBlock(Block & processed, MutableColumns && left_columns, MutableColumns && right_columns,
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size_t left_position, size_t right_position, size_t right_block_number);
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void mergeRightBlocks();
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template <bool in_memory>
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size_t rightBlocksCount();
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template <bool in_memory, bool is_all>
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void joinSortedBlock(Block & block, ExtraBlockPtr & not_processed);
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template <bool in_memory>
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std::shared_ptr<Block> loadRightBlock(size_t pos);
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template <bool is_all> /// ALL or ANY
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bool leftJoin(MergeJoinCursor & left_cursor, const Block & left_block, const Block & right_block,
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MutableColumns & left_columns, MutableColumns & right_columns, size_t & left_key_tail, size_t & skip_right);
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bool semiLeftJoin(MergeJoinCursor & left_cursor, const Block & left_block, const Block & right_block,
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MutableColumns & left_columns, MutableColumns & right_columns);
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bool allInnerJoin(MergeJoinCursor & left_cursor, const Block & left_block, const Block & right_block,
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MutableColumns & left_columns, MutableColumns & right_columns, size_t & left_key_tail, size_t & skip_right);
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bool saveRightBlock(Block && block);
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void mergeInMemoryRightBlocks();
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void mergeFlushedRightBlocks();
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};
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}
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