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