greenplumn CDXLScalarNullIf 源码
greenplumn CDXLScalarNullIf 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarNullIf.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CDXLScalarNullIf.h
//
// @doc:
// Class for representing DXL scalar NullIf operator
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarNullIf_H
#define GPDXL_CDXLScalarNullIf_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarNullIf
//
// @doc:
// Class for representing DXL scalar NullIf operator
//
//---------------------------------------------------------------------------
class CDXLScalarNullIf : public CDXLScalar
{
private:
// operator number
IMDId *m_mdid_op;
// return type
IMDId *m_mdid_type;
public:
CDXLScalarNullIf(CDXLScalarNullIf &) = delete;
// ctor
CDXLScalarNullIf(CMemoryPool *mp, IMDId *mdid_op, IMDId *mdid_type);
// dtor
~CDXLScalarNullIf() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// operator id
virtual IMDId *MdIdOp() const;
// return type
virtual IMDId *MdidType() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// does the operator return a boolean result
BOOL HasBoolResult(CMDAccessor *md_accessor) const override;
// conversion function
static CDXLScalarNullIf *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarNullIf == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarNullIf *>(dxl_op);
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *dxlnode,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarNullIf_H
// EOF
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