greenplumn CScalarProjectElement 源码
greenplumn CScalarProjectElement 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarProjectElement.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarProjectElement.h
//
// @doc:
// Scalar project element operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarProjectElement_H
#define GPOPT_CScalarProjectElement_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarProjectElement
//
// @doc:
// Scalar project element operator is used to define a column reference
// as equivalent to a scalar expression
//
//---------------------------------------------------------------------------
class CScalarProjectElement : public CScalar
{
private:
// defined column reference
CColRef *m_pcr;
public:
CScalarProjectElement(const CScalarProjectElement &) = delete;
// ctor
CScalarProjectElement(CMemoryPool *mp, CColRef *colref)
: CScalar(mp), m_pcr(colref)
{
GPOS_ASSERT(nullptr != colref);
}
// dtor
~CScalarProjectElement() override = default;
// identity accessor
EOperatorId
Eopid() const override
{
return EopScalarProjectElement;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarProjectElement";
}
// defined column reference accessor
CColRef *
Pcr() const
{
return m_pcr;
}
// operator specific hash function
ULONG HashValue() const override;
// match function
BOOL Matches(COperator *pop) const override;
// sensitivity to order of inputs
BOOL FInputOrderSensitive() const override;
// return a copy of the operator with remapped columns
COperator *PopCopyWithRemappedColumns(CMemoryPool *mp,
UlongToColRefMap *colref_mapping,
BOOL must_exist) override;
// return locally defined columns
CColRefSet *
PcrsDefined(CMemoryPool *mp,
CExpressionHandle & // exprhdl
) override
{
CColRefSet *pcrs = GPOS_NEW(mp) CColRefSet(mp);
pcrs->Include(m_pcr);
return pcrs;
}
// conversion function
static CScalarProjectElement *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarProjectElement == pop->Eopid());
return dynamic_cast<CScalarProjectElement *>(pop);
}
IMDId *
MdidType() const override
{
GPOS_ASSERT(!"Invalid function call: CScalarProjectElemet::MdidType()");
return nullptr;
}
// print
IOstream &OsPrint(IOstream &os) const override;
}; // class CScalarProjectElement
} // namespace gpopt
#endif // !GPOPT_CScalarProjectElement_H
// EOF
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