greenplumn CXformImplementConstTableGet 源码
greenplumn CXformImplementConstTableGet 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementConstTableGet.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformImplementConstTableGet.h
//
// @doc:
// Implement logical const table with a physical const table get
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementConstTableGet_H
#define GPOPT_CXformImplementConstTableGet_H
#include "gpos/base.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementConstTableGet
//
// @doc:
// Implement const table get
//
//---------------------------------------------------------------------------
class CXformImplementConstTableGet : public CXformImplementation
{
private:
public:
CXformImplementConstTableGet(const CXformImplementConstTableGet &) = delete;
// ctor
explicit CXformImplementConstTableGet(CMemoryPool *);
// dtor
~CXformImplementConstTableGet() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementConstTableGet;
}
// return a string for xform name
const CHAR *
SzId() const override
{
return "CXformImplementConstTableGet";
}
// 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 CXformImplementConstTableGet
} // namespace gpopt
#endif // !GPOPT_CXformImplementConstTableGet_H
// EOF
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