greenplumn CScalarFunc 源码

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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