greenplumn CScalarProjectList 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarProjectList.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2009 Greenplum, Inc.
/
/ @filename:
/ CScalarProjectList.h
/
/ @doc:
/ Projection list
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarProjectList_H
#define GPOPT_CScalarProjectList_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
namespace gpopt
{
using namespace gpos;
/---------------------------------------------------------------------------
/ @class:
/ CScalarProjectList
/
/ @doc:
/ Projection list operator
/
/---------------------------------------------------------------------------
class CScalarProjectList : public CScalar
{
private:
public:
CScalarProjectList(const CScalarProjectList &) = delete;
/ ctor
explicit CScalarProjectList(CMemoryPool *mp);
/ dtor
~CScalarProjectList() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarProjectList;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarProjectList";
}
/ 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 PopCopyDefault();
}
/ conversion function
static CScalarProjectList *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarProjectList == pop->Eopid());
return dynamic_cast<CScalarProjectList *>(pop);
}
IMDId *
MdidType() const override
{
GPOS_ASSERT(!"Invalid function call: CScalarProjectList::MdidType()");
return nullptr;
}
/ return number of distinct aggs in project list attached to given handle
static ULONG UlDistinctAggs(CExpressionHandle &exprhdl);
/ return number of ordered aggs in project list attached to given handle
static ULONG UlOrderedAggs(CExpressionHandle &exprhdl);
/ check if a project list has multiple distinct aggregates
static BOOL FHasMultipleDistinctAggs(CExpressionHandle &exprhdl);
/ check if a project list has a scalar func
static BOOL FHasScalarFunc(CExpressionHandle &exprhdl);
}; / class CScalarProjectList
} / namespace gpopt
#endif / !GPOPT_CScalarProjectList_H
/ EOF
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