greenplumn CScalarOp 源码
greenplumn CScalarOp 代码
文件路径：/src/backend/gporca/libgpopt/include/gpopt/operators/CScalarOp.h
//---------------------------------------------------------------------------
// 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
{
private:
// 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 &);
public:
// ctor
CScalarOp(CMemoryPool *mp, IMDId *mdid_op, IMDId *return_type_mdid,
const CWStringConst *pstrOp);
// dtor
~CScalarOp() override
{
m_mdid_op->Release();
CRefCount::SafeRelease(m_return_type_mdid);
GPOS_DELETE(m_pstrOp);
}
// ident accessors
EOperatorId
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
相关信息
相关文章
greenplumn CExpressionFactorizer 源码
greenplumn CExpressionHandle 源码
greenplumn CExpressionPreprocessor 源码
greenplumn CExpressionUtils 源码
0
赞
热门推荐
-
2、 - 优质文章
-
3、 gate.io
-
6、 golang
-
8、 openharmony