greenplumn CXformLeftSemiJoin2HashJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiJoin2HashJoin.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CXformLeftSemiJoin2HashJoin.h
/
/ @doc:
/ Transform left semi join to left semi hash join
/---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiJoin2HashJoin_H
#define GPOPT_CXformLeftSemiJoin2HashJoin_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CXformLeftSemiJoin2HashJoin
/
/ @doc:
/ Transform left semi join to left semi hash join
/
/---------------------------------------------------------------------------
class CXformLeftSemiJoin2HashJoin : public CXformImplementation
{
private:
public:
CXformLeftSemiJoin2HashJoin(const CXformLeftSemiJoin2HashJoin &) = delete;
/ ctor
explicit CXformLeftSemiJoin2HashJoin(CMemoryPool *mp);
/ dtor
~CXformLeftSemiJoin2HashJoin() override = default;
/ ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiJoin2HashJoin;
}
/ return a string for xform name
const CHAR *
SzId() const override
{
return "CXformLeftSemiJoin2HashJoin";
}
/ compute xform promise for a given expression handle
EXformPromise Exfp(CExpressionHandle &exprhdl) const override;
/ actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; / class CXformLeftSemiJoin2HashJoin
} / namespace gpopt
#endif / !GPOPT_CXformLeftSemiJoin2HashJoin_H
/ EOF
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