greenplumn CScalarProjectList 源码
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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