greenplumn CXformIntersect2Join 源码
greenplumn CXformIntersect2Join 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformIntersect2Join.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2013 VMware, Inc. or its affiliates.
//
// @filename:
// CXformIntersect2Join.h
//
// @doc:
// Class to transform of Intersect into a Join
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformIntersect2Join_H
#define GPOPT_CXformIntersect2Join_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformIntersect2Join
//
// @doc:
// Class to transform of Intersect into a Join
//
//---------------------------------------------------------------------------
class CXformIntersect2Join : public CXformExploration
{
private:
public:
CXformIntersect2Join(const CXformIntersect2Join &) = delete;
// ctor
explicit CXformIntersect2Join(CMemoryPool *mp);
// dtor
~CXformIntersect2Join() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfIntersect2Join;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformIntersect2Join";
}
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle & // exprhdl
) const override
{
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *pxfctxt, CXformResult *pxfres,
CExpression *pexpr) const override;
}; // class CXformIntersect2Join
} // namespace gpopt
#endif // !GPOPT_CXformIntersect2Join_H
// EOF
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