greenplumn CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations 源码
greenplumn CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 EMC Corp.
//
// @filename:
// CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations.h
//
// @doc:
// Turn LS apply into LS join (NotIn semantics) when inner child has no
// outer references
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations_H
#define GPOPT_CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiApplyNotIn.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoinNotIn.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations
: public CXformApply2Join<CLogicalLeftAntiSemiApplyNotIn,
CLogicalLeftAntiSemiJoinNotIn>
{
private:
public:
CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations(
const CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations
&) = delete;
// ctor
explicit CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations(
CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftAntiSemiApplyNotIn,
CLogicalLeftAntiSemiJoinNotIn>(mp)
{
}
// dtor
~CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations()
override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations;
}
// xform name
const CHAR *
SzId() const override
{
return "CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations";
}
// 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 CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations
} // namespace gpopt
#endif // !GPOPT_CXformLeftAntiSemiApplyNotIn2LeftAntiSemiJoinNotInNoCorrelations_H
// EOF
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