greenplumn CXformLeftAntiSemiApply2LeftAntiSemiJoin 源码
greenplumn CXformLeftAntiSemiApply2LeftAntiSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftAntiSemiApply2LeftAntiSemiJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformLeftAntiSemiApply2LeftAntiSemiJoin.h
//
// @doc:
// Turn LAS apply into LAS join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoin_H
#define GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftAntiSemiApply.h"
#include "gpopt/operators/CLogicalLeftAntiSemiJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftAntiSemiApply2LeftAntiSemiJoin
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftAntiSemiApply2LeftAntiSemiJoin
: public CXformApply2Join<CLogicalLeftAntiSemiApply,
CLogicalLeftAntiSemiJoin>
{
private:
public:
CXformLeftAntiSemiApply2LeftAntiSemiJoin(
const CXformLeftAntiSemiApply2LeftAntiSemiJoin &) = delete;
// ctor
explicit CXformLeftAntiSemiApply2LeftAntiSemiJoin(CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftAntiSemiApply, CLogicalLeftAntiSemiJoin>(
mp, true /*fDeepTree*/)
{
}
// dtor
~CXformLeftAntiSemiApply2LeftAntiSemiJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftAntiSemiApply2LeftAntiSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformLeftAntiSemiApply2LeftAntiSemiJoin";
}
// 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 CXformLeftAntiSemiApply2LeftAntiSemiJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftAntiSemiApply2LeftAntiSemiJoin_H
// EOF
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