greenplumn CXformLeftSemiApply2LeftSemiJoin 源码
greenplumn CXformLeftSemiApply2LeftSemiJoin 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformLeftSemiApply2LeftSemiJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CXformLeftSemiApply2LeftSemiJoin.h
//
// @doc:
// Turn LS apply into LS join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformLeftSemiApply2LeftSemiJoin_H
#define GPOPT_CXformLeftSemiApply2LeftSemiJoin_H
#include "gpos/base.h"
#include "gpopt/operators/CLogicalLeftSemiApply.h"
#include "gpopt/operators/CLogicalLeftSemiJoin.h"
#include "gpopt/xforms/CXformApply2Join.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformLeftSemiApply2LeftSemiJoin
//
// @doc:
// Transform Apply into Join by decorrelating the inner side
//
//---------------------------------------------------------------------------
class CXformLeftSemiApply2LeftSemiJoin
: public CXformApply2Join<CLogicalLeftSemiApply, CLogicalLeftSemiJoin>
{
private:
public:
CXformLeftSemiApply2LeftSemiJoin(const CXformLeftSemiApply2LeftSemiJoin &) =
delete;
// ctor
explicit CXformLeftSemiApply2LeftSemiJoin(CMemoryPool *mp)
: CXformApply2Join<CLogicalLeftSemiApply, CLogicalLeftSemiJoin>(
mp, true /*fDeepTree*/)
{
}
// ctor with a passed pattern
CXformLeftSemiApply2LeftSemiJoin(CMemoryPool *mp, CExpression *pexprPattern)
: CXformApply2Join<CLogicalLeftSemiApply, CLogicalLeftSemiJoin>(
mp, pexprPattern)
{
}
// dtor
~CXformLeftSemiApply2LeftSemiJoin() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfLeftSemiApply2LeftSemiJoin;
}
const CHAR *
SzId() const override
{
return "CXformLeftSemiApply2LeftSemiJoin";
}
// 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 CXformLeftSemiApply2LeftSemiJoin
} // namespace gpopt
#endif // !GPOPT_CXformLeftSemiApply2LeftSemiJoin_H
// EOF
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