greenplumn CScalarWindowFunc 源码
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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