greenplumn CXformImplementSequenceProject 源码
greenplumn CXformImplementSequenceProject 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/xforms/CXformImplementSequenceProject.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CXformImplementSequenceProject.h
//
// @doc:
// Transform Logical Sequence Project to Physical Sequence Project
//---------------------------------------------------------------------------
#ifndef GPOPT_CXformImplementSequenceProject_H
#define GPOPT_CXformImplementSequenceProject_H
#include "gpos/base.h"
#include "gpopt/operators/CExpressionHandle.h"
#include "gpopt/xforms/CXformImplementation.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CXformImplementSequenceProject
//
// @doc:
// Transform Project to ComputeScalar
//
//---------------------------------------------------------------------------
class CXformImplementSequenceProject : public CXformImplementation
{
private:
public:
CXformImplementSequenceProject(const CXformImplementSequenceProject &) =
delete;
// ctor
explicit CXformImplementSequenceProject(CMemoryPool *mp);
// dtor
~CXformImplementSequenceProject() override = default;
// ident accessors
EXformId
Exfid() const override
{
return ExfImplementSequenceProject;
}
const CHAR *
SzId() const override
{
return "CXformImplementSequenceProject";
}
// compute xform promise for a given expression handle
EXformPromise
Exfp(CExpressionHandle &exprhdl) const override
{
if (exprhdl.DeriveHasSubquery(1))
{
return CXform::ExfpNone;
}
return CXform::ExfpHigh;
}
// actual transform
void Transform(CXformContext *, CXformResult *,
CExpression *) const override;
}; // class CXformImplementSequenceProject
} // namespace gpopt
#endif // !GPOPT_CXformImplementSequenceProject_H
// EOF
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