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54 lines
1.6 KiB
C++
54 lines
1.6 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 <Columns/IColumn.h>
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#include <DataStreams/IBlockStream_fwd.h>
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namespace DB
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{
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class Block;
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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 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;
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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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virtual bool hasTotals() const = 0;
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/// Set totals for right table
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virtual void setTotals(const Block & block) = 0;
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/// Add totals to block from left table
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virtual void joinTotals(Block & block) const = 0;
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virtual size_t getTotalRowCount() const = 0;
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virtual size_t getTotalByteCount() const = 0;
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virtual bool alwaysReturnsEmptySet() const { return false; }
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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 false; }
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virtual BlockInputStreamPtr createStreamWithNonJoinedRows(const Block &, UInt64) const { return {}; }
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};
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using JoinPtr = std::shared_ptr<IJoin>;
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}
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