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130 lines
3.7 KiB
C++
130 lines
3.7 KiB
C++
#pragma once
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#include <memory>
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#include <vector>
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#include <Core/Names.h>
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#include <Core/Block.h>
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#include <Columns/IColumn.h>
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#include <Common/Exception.h>
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namespace DB
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{
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struct ExtraBlock;
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using ExtraBlockPtr = std::shared_ptr<ExtraBlock>;
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class TableJoin;
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class NotJoinedBlocks;
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class IBlocksStream;
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using IBlocksStreamPtr = std::shared_ptr<IBlocksStream>;
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class IJoin;
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using JoinPtr = std::shared_ptr<IJoin>;
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enum class JoinPipelineType
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{
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/*
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* Right stream processed first, then when join data structures are ready, the left stream is processed using it.
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* The pipeline is not sorted.
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*/
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FillRightFirst,
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/*
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* Only the left stream is processed. Right is already filled.
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*/
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FilledRight,
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/*
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* The pipeline is created from the left and right streams processed with merging transform.
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* Left and right streams have the same priority and are processed simultaneously.
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* The pipelines are sorted.
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*/
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YShaped,
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};
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class IJoin
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{
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public:
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virtual ~IJoin() = default;
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virtual const TableJoin & getTableJoin() const = 0;
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/// Add block of data from right hand of JOIN.
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/// @returns false, if some limit was exceeded and you should not insert more data.
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virtual bool addJoinedBlock(const Block & block, bool check_limits = true) = 0; /// NOLINT
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/* Some initialization may be required before joinBlock() call.
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* It's better to done in in constructor, but left block exact structure is not known at that moment.
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* TODO: pass correct left block sample to the constructor.
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*/
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virtual void initialize(const Block & /* left_sample_block */) {}
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virtual void checkTypesOfKeys(const Block & block) const = 0;
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/// Join the block with data from left hand of JOIN to the right hand data (that was previously built by calls to addJoinedBlock).
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/// Could be called from different threads in parallel.
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virtual void joinBlock(Block & block, std::shared_ptr<ExtraBlock> & not_processed) = 0;
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/** Set/Get totals for right table
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* Keep "totals" (separate part of dataset, see WITH TOTALS) to use later.
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*/
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virtual void setTotals(const Block & block) { totals = block; }
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virtual const Block & getTotals() const { return totals; }
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/// Number of rows/bytes stored in memory
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virtual size_t getTotalRowCount() const = 0;
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virtual size_t getTotalByteCount() const = 0;
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/// Returns true if no data to join with.
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virtual bool alwaysReturnsEmptySet() const = 0;
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/// StorageJoin/Dictionary is already filled. No need to call addJoinedBlock.
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/// Different query plan is used for such joins.
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virtual bool isFilled() const { return pipelineType() == JoinPipelineType::FilledRight; }
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virtual JoinPipelineType pipelineType() const { return JoinPipelineType::FillRightFirst; }
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// That can run FillingRightJoinSideTransform parallelly
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virtual bool supportParallelJoin() const { return false; }
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virtual bool supportTotals() const { return true; }
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/// Peek next stream of delayed joined blocks.
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virtual IBlocksStreamPtr getDelayedBlocks() { return nullptr; }
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virtual bool hasDelayedBlocks() const { return false; }
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virtual IBlocksStreamPtr
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getNonJoinedBlocks(const Block & left_sample_block, const Block & result_sample_block, UInt64 max_block_size) const = 0;
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private:
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Block totals;
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};
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class IBlocksStream
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{
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public:
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/// Returns empty block on EOF
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Block next()
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{
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if (finished)
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return {};
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if (Block res = nextImpl())
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return res;
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finished = true;
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return {};
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}
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virtual ~IBlocksStream() = default;
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bool isFinished() const { return finished; }
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protected:
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virtual Block nextImpl() = 0;
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std::atomic_bool finished{false};
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};
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}
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