greenplumn CScalarFunc 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarFunc.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CScalarFunc.h
/
/ @doc:
/ Class for scalar function calls
/---------------------------------------------------------------------------
#ifndef GPOPT_CScalarFunc_H
#define GPOPT_CScalarFunc_H
#include "gpos/base.h"
#include "gpopt/base/CDrvdProp.h"
#include "gpopt/operators/CScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpopt
{
using namespace gpos;
using namespace gpmd;
/---------------------------------------------------------------------------
/ @class:
/ CScalarFunc
/
/ @doc:
/ scalar function operator
/
/---------------------------------------------------------------------------
class CScalarFunc : public CScalar
{
protected:
/ func id
IMDId *m_func_mdid;
/ return type
IMDId *m_return_type_mdid;
const INT m_return_type_modifier;
/ function name
const CWStringConst *m_pstrFunc;
/ function stability
IMDFunction::EFuncStbl m_efs;
/ can the function return multiple rows?
BOOL m_returns_set;
/ does operator return NULL on NULL input?
BOOL m_returns_null_on_null_input;
/ is operator return type BOOL?
BOOL m_fBoolReturnType;
private:
public:
CScalarFunc(const CScalarFunc &) = delete;
explicit CScalarFunc(CMemoryPool *mp);
/ ctor
CScalarFunc(CMemoryPool *mp, IMDId *mdid_func, IMDId *mdid_return_type,
INT return_type_modifier, const CWStringConst *pstrFunc);
/ dtor
~CScalarFunc() override;
/ ident accessors
EOperatorId
Eopid() const override
{
return EopScalarFunc;
}
/ return a string for operator name
const CHAR *
SzId() const override
{
return "CScalarFunc";
}
/ 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();
}
/ derive function properties
CFunctionProp *
DeriveFunctionProperties(CMemoryPool *mp,
CExpressionHandle &exprhdl) const override
{
return PfpDeriveFromChildren(mp, exprhdl, m_efs,
false /*fHasVolatileFunctionScan*/,
false /*fScan*/);
}
/ derive non-scalar function existence
BOOL FHasNonScalarFunction(CExpressionHandle &exprhdl) override;
/ conversion function
static CScalarFunc *
PopConvert(COperator *pop)
{
GPOS_ASSERT(nullptr != pop);
GPOS_ASSERT(EopScalarFunc == pop->Eopid());
return dynamic_cast<CScalarFunc *>(pop);
}
/ function name
const CWStringConst *PstrFunc() const;
/ func id
IMDId *FuncMdId() const;
INT TypeModifier() const override;
/ the type of the scalar expression
IMDId *MdidType() const override;
/ function stability
IMDFunction::EFuncStbl EfsGetFunctionStability() const;
/ boolean expression evaluation
EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;
/ print
IOstream &OsPrint(IOstream &os) const override;
}; / class CScalarFunc
} / namespace gpopt
#endif / !GPOPT_CScalarFunc_H
/ EOF
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