greenplumn CScalarSortGroupClause 源码
greenplumn CScalarSortGroupClause 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarSortGroupClause.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 EMC Corp.
//
// @filename:
// CScalarSortGroupClause.h
//
// @doc:
// An operator class that wraps a sort group clause
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarSortGroupClause_H
#define GPOPT_CScalarSortGroupClause_H
#include "gpos/base.h"
#include "gpopt/base/CColRefSet.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
using namespace gpnaucrates;
//---------------------------------------------------------------------------
// @class:
// CScalarSortGroupClause
//
// @doc:
// A wrapper operator for sort group clause
//
//---------------------------------------------------------------------------
class CScalarSortGroupClause : public CScalar
{
private:
INT m_tle_sort_group_ref;
INT m_eqop;
INT m_sortop;
BOOL m_nulls_first;
BOOL m_hashable;
public:
// private copy ctor
CScalarSortGroupClause(const CScalarSortGroupClause &) = delete;
// ctor
CScalarSortGroupClause(CMemoryPool *mp, INT tle_sort_group_ref, INT eqop,
INT sortop, BOOL nulls_first, BOOL hashable);
~CScalarSortGroupClause() override = default;
INT
Index() const
{
return m_tle_sort_group_ref;
}
INT
EqOp() const
{
return m_eqop;
}
INT
SortOp() const
{
return m_sortop;
}
BOOL
NullsFirst() const
{
return m_nulls_first;
}
BOOL
IsHashable() const
{
return m_hashable;
}
// identity accessor
EOperatorId
Eopid() const override
{
return EopScalarSortGroupClause;
}
// return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarSortGroupClause";
}
// match function
BOOL Matches(COperator *op) const override;
// conversion function
static CScalarSortGroupClause *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarSortGroupClause == pop->Eopid());
return dynamic_cast<CScalarSortGroupClause *>(pop);
}
// the type of the scalar expression
IMDId *
MdidType() const override
{
return nullptr;
}
INT TypeModifier() const override;
// boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *) const override;
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
BOOL
FInputOrderSensitive() const override
{
return false;
}
// print
IOstream &OsPrint(IOstream &io) const override;
}; // class CScalarSortGroupClause
} // namespace gpopt
#endif // !GPOPT_CScalarSortGroupClause_H
// EOF
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