greenplumn CXformMaxOneRow2Assert 源码
greenplumn CXformMaxOneRow2Assert 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformMaxOneRow2Assert.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CXformMaxOneRow2Assert.h
//
// @doc:
// Transform MaxOneRow into LogicalAssert
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformMaxOneRow2Assert_H
#define GPOPT_CXformMaxOneRow2Assert_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformMaxOneRow2Assert
//
// @doc:
// Transform MaxOneRow into LogicalAssert
//
//---------------------------------------------------------------------------
class CXformMaxOneRow2Assert : public CXformExploration
{
private:
public:
CXformMaxOneRow2Assert(const CXformMaxOneRow2Assert &) = delete;
// ctor
explicit CXformMaxOneRow2Assert(CMemoryPool *mp);
// dtor
~CXformMaxOneRow2Assert() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfMaxOneRow2Assert;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformMaxOneRow2Assert";
}
// 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 CXformMaxOneRow2Assert
} // namespace gpopt
#endif // !GPOPT_CXformMaxOneRow2Assert_H
// EOF
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