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
相关信息
相关文章
greenplumn CDXLCtasStorageOptions 源码