greenplumn CXformCTEAnchor2TrivialSelect 源码
greenplumn CXformCTEAnchor2TrivialSelect 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformCTEAnchor2TrivialSelect.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformCTEAnchor2TrivialSelect.h
//
// @doc:
// Transform logical CTE anchor to select with "true" predicate
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformCTEAnchor2TrivialSelect_H
#define GPOPT_CXformCTEAnchor2TrivialSelect_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformExploration.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformCTEAnchor2TrivialSelect
//
// @doc:
// Transform logical CTE anchor to select with "true" predicate
//
//---------------------------------------------------------------------------
class CXformCTEAnchor2TrivialSelect : public CXformExploration
{
private:
public:
CXformCTEAnchor2TrivialSelect(const CXformCTEAnchor2TrivialSelect &) =
delete;
// ctor
explicit CXformCTEAnchor2TrivialSelect(CMemoryPool *mp);
// dtor
~CXformCTEAnchor2TrivialSelect() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfCTEAnchor2TrivialSelect;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformCTEAnchor2TrivialSelect";
}
// 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 CXformCTEAnchor2TrivialSelect
} // namespace gpopt
#endif // !GPOPT_CXformCTEAnchor2TrivialSelect_H
// EOF
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