greenplumn CScalarOp 源码

  • 2022-08-18
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greenplumn CScalarOp 代码


//	Greenplum Database
//	Copyright (C) 2011 EMC Corp.
//	@filename:
//		CScalarOp.h
//	@doc:
//		Base class for all scalar operations such as arithmetic and string
//		evaluations
#ifndef GPOPT_CScalarOp_H
#define GPOPT_CScalarOp_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:
//		CScalarOp
//	@doc:
//		general scalar operation such as arithmetic and string evaluations
class CScalarOp : public CScalar
	// metadata id in the catalog
	IMDId *m_mdid_op;

	// return type id or NULL if it can be inferred from the metadata
	IMDId *m_return_type_mdid;

	// scalar operator name
	const CWStringConst *m_pstrOp;

	// does operator return NULL on NULL input?
	BOOL m_returns_null_on_null_input;

	// is operator return type BOOL?
	BOOL m_fBoolReturnType;

	// is operator commutative
	BOOL m_fCommutative;

	// private copy ctor
	CScalarOp(const CScalarOp &);

	// ctor
	CScalarOp(CMemoryPool *mp, IMDId *mdid_op, IMDId *return_type_mdid,
			  const CWStringConst *pstrOp);

	// dtor
	~CScalarOp() override

	// ident accessors
	Eopid() const override
		return EopScalarOp;

	// return a string for operator name
	const CHAR *
	SzId() const override
		return "CScalarOp";

	// accessor to the return type field
	IMDId *GetReturnTypeMdId() const;

	// the type of the scalar expression
	IMDId *MdidType() const override;

	// 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 a copy of the operator with remapped columns
	COperator *
	PopCopyWithRemappedColumns(CMemoryPool *,		//mp,
							   UlongToColRefMap *,	//colref_mapping,
							   BOOL					//must_exist
							   ) override
		return PopCopyDefault();

	// conversion function
	static CScalarOp *
	PopConvert(COperator *pop)
		GPOS_ASSERT(nullptr != pop);
		GPOS_ASSERT(EopScalarOp == pop->Eopid());

		return dynamic_cast<CScalarOp *>(pop);

	// helper function
	static BOOL FCommutative(const IMDId *pcmdidOtherOp);

	// boolean expression evaluation
	EBoolEvalResult Eber(ULongPtrArray *pdrgpulChildren) const override;

	// name of the scalar operator
	const CWStringConst *Pstr() const;

	// metadata id
	IMDId *MdIdOp() const;

	// print
	IOstream &OsPrint(IOstream &os) const override;

};	// class CScalarOp

}  // namespace gpopt

#endif	// !GPOPT_CScalarOp_H

// EOF


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