greenplumn CXformUpdate2DML 源码
greenplumn CXformUpdate2DML 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformUpdate2DML.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp
//
// @filename:
// CXformUpdate2DML.h
//
// @doc:
// Transform Logical Update to Logical DML
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformUpdate2DML_H
#define GPOPT_CXformUpdate2DML_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformUpdate2DML
//
// @doc:
// Transform Logical Update to Logical DML
//
//---------------------------------------------------------------------------
class CXformUpdate2DML : public CXformExploration
{
private:
public:
CXformUpdate2DML(const CXformUpdate2DML &) = delete;
// ctor
explicit CXformUpdate2DML(CMemoryPool *mp);
// dtor
~CXformUpdate2DML() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfUpdate2DML;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformUpdate2DML";
}
// 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 CXformUpdate2DML
} // namespace gpopt
#endif // !GPOPT_CXformUpdate2DML_H
// EOF
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