greenplumn CScalarFunc 源码

  • 2022-08-18
  • 浏览 (5)

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

相关信息

greenplumn 源码目录

相关文章

greenplumn CExpression 源码

greenplumn CExpressionFactorizer 源码

greenplumn CExpressionHandle 源码

greenplumn CExpressionPreprocessor 源码

greenplumn CExpressionUtils 源码

greenplumn CHashedDistributions 源码

greenplumn CLogical 源码

greenplumn CLogicalApply 源码

greenplumn CLogicalAssert 源码

greenplumn CLogicalBitmapTableGet 源码

0  赞