greenplumn CScalarWindowFunc 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarWindowFunc.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2012 EMC Corp.
/
/ @filename:
/ CScalarWindowFunc.h
/
/ @doc:
/ Class for scalar window function
/
/ @owner:
/
/
/ @test:
/
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarWindowFunc_H
#define GPOPT_CScalarWindowFunc_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalarFunc.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CScalarWindowFunc
/
/ @doc:
/ Class for scalar window function
/
/---------------------------------------------------------------------------
class CScalarWindowFunc : public CScalarFunc
{
public:
/ window stage
enum EWinStage
{
EwsImmediate,
EwsPreliminary,
EwsRowKey,
EwsSentinel
};
private:
/ window stage
EWinStage m_ewinstage;
/ distinct window computation
BOOL m_is_distinct;
/* TRUE if argument list was really '*' */
BOOL m_is_star_arg;
/* is function a simple aggregate? */
BOOL m_is_simple_agg;
/ aggregate window function, e.g. count(*) over()
BOOL m_fAgg;
public:
CScalarWindowFunc(const CScalarWindowFunc &) = delete;
/ ctor
CScalarWindowFunc(CMemoryPool *mp, IMDId *mdid_func,
IMDId *mdid_return_type, const CWStringConst *pstrFunc,
EWinStage ewinstage, BOOL is_distinct, BOOL is_star_arg,
BOOL is_simple_agg);
/ dtor
~CScalarWindowFunc() override = default;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarWindowFunc;
}
/ return a string for window function
const CHAR *
SzId() const override
{
return "CScalarWindowFunc";
}
EWinStage
Ews() const
{
return m_ewinstage;
}
/ operator specific hash function
ULONG HashValue() const override;
/ match function
BOOL Matches(COperator *pop) const override;
/ conversion function
static CScalarWindowFunc *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarWindowFunc == pop->Eopid());
return dynamic_cast<CScalarWindowFunc *>(pop);
}
/ does window function definition include Distinct?
BOOL
IsDistinct() const
{
return m_is_distinct;
}
BOOL
IsStarArg() const
{
return m_is_star_arg;
}
BOOL
IsSimpleAgg() const
{
return m_is_simple_agg;
}
/ is window function defined as Aggregate?
BOOL
FAgg() const
{
return m_fAgg;
}
/ print
IOstream &OsPrint(IOstream &os) const override;
}; / class CScalarWindowFunc
} / namespace gpopt
#endif / !GPOPT_CScalarWindowFunc_H
/ EOF
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