ClickHouse/dbms/Interpreters/IJoin.h

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#pragma once
#include <memory>
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#include <vector>
#include <Core/Names.h>
#include <Columns/IColumn.h>
#include <DataStreams/IBlockStream_fwd.h>
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namespace DB
{
class Block;
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struct ExtraBlock;
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class IJoin
{
public:
virtual ~IJoin() = default;
/// Add block of data from right hand of JOIN.
/// @returns false, if some limit was exceeded and you should not insert more data.
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).
/// 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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virtual void setTotals(const Block & block) = 0;
virtual void joinTotals(Block & block) const = 0;
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virtual size_t getTotalRowCount() const = 0;
virtual size_t getTotalByteCount() const = 0;
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virtual bool alwaysReturnsEmptySet() const { return false; }
virtual BlockInputStreamPtr createStreamWithNonJoinedRows(const Block &, UInt64) const { return {}; }
virtual bool hasStreamWithNonJoinedRows() const { return false; }
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};
using JoinPtr = std::shared_ptr<IJoin>;
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}