greenplumn CScalarCoalesce 源码
greenplumn CScalarCoalesce 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarCoalesce.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CScalarCoalesce.h
//
// @doc:
// Scalar coalesce operator
//---------------------------------------------------------------------------
#ifndef GPOPT_CScalarCoalesce_H
#define GPOPT_CScalarCoalesce_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
//---------------------------------------------------------------------------
// @class:
// CScalarCoalesce
//
// @doc:
// Scalar coalesce operator
//
//---------------------------------------------------------------------------
class CScalarCoalesce : public CScalar
{
private:
// return type
IMDId *m_mdid_type;
// is operator return type BOOL?
BOOL m_fBoolReturnType;
public:
CScalarCoalesce(const CScalarCoalesce &) = delete;
// ctor
CScalarCoalesce(CMemoryPool *mp, IMDId *mdid_type);
// dtor
~CScalarCoalesce() override;
// ident accessors
EOperatorId
Eopid() const override
{
return EopScalarCoalesce;
}
// operator name
const CHAR *
SzId() const override
{
return "CScalarCoalesce";
}
// return type
IMDId *
MdidType() const override
{
return m_mdid_type;
}
// 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 true;
}
// return a copy of the operator with remapped columns
COperator *
PopCopyWithRemappedColumns(CMemoryPool *, //mp,
UlongToColRefMap *, //colref_mapping,
BOOL //must_exist
) override
{
return PopCopyDefault();
}
// boolean expression evaluation
EBoolEvalResult
Eber(ULongPtrArray *pdrgpulChildren) const override
{
// Coalesce returns the first not-null child,
// if all children are Null, then Coalesce must return Null
return EberNullOnAllNullChildren(pdrgpulChildren);
}
// conversion function
static CScalarCoalesce *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarCoalesce == pop->Eopid());
return dynamic_cast<CScalarCoalesce *>(pop);
}
}; // class CScalarCoalesce
} // namespace gpopt
#endif // !GPOPT_CScalarCoalesce_H
// EOF
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