greenplumn CScalarIdent 源码
greenplumn CScalarIdent 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarIdent.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2009 Greenplum, Inc.
//
// @filename:
// CScalarIdent.h
//
// @doc:
// Scalar column identifier
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarIdent_H
#define GPOPT_CScalarIdent_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarIdent
//
// @doc:
// scalar identifier operator
//
//---------------------------------------------------------------------------
class CScalarIdent : public CScalar
{
private:
// column
const CColRef *m_pcr;
public:
CScalarIdent(const CScalarIdent &) = delete;
// ctor
CScalarIdent(CMemoryPool *mp, const CColRef *colref)
: CScalar(mp), m_pcr(colref)
{
}
// dtor
~CScalarIdent() override = default;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarIdent;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarIdent";
}
// accessor
const 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 used columns
CColRefSet *
PcrsUsed(CMemoryPool *mp,
CExpressionHandle & // exprhdl
) override
{
CColRefSet *pcrs = GPOS_NEW(mp) CColRefSet(mp);
pcrs->Include(m_pcr);
return pcrs;
}
// conversion function
static CScalarIdent *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarIdent == pop->Eopid());
return dynamic_cast<CScalarIdent *>(pop);
}
// the type of the scalar expression
IMDId *MdidType() const override;
// the type modifier of the scalar expression
INT TypeModifier() const override;
// print
IOstream &OsPrint(IOstream &os) const override;
// is the given expression a scalar cast of a scalar identifier
static BOOL FCastedScId(CExpression *pexpr);
// is the given expression a scalar cast of given scalar identifier
static BOOL FCastedScId(CExpression *pexpr, CColRef *colref);
// is the given expression a scalar func allowed for Partition selection of given scalar identifier
static BOOL FAllowedFuncScId(CExpression *pexpr);
// is the given expression a scalar func allowed for Partition selection of given scalar identifier
static BOOL FAllowedFuncScId(CExpression *pexpr, CColRef *colref);
}; // class CScalarIdent
} // namespace gpopt
#endif // !GPOPT_CScalarIdent_H
// EOF
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