greenplumn CDXLScalarDistinctComp 源码
greenplumn CDXLScalarDistinctComp 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarDistinctComp.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLScalarDistinctComp.h
//
// @doc:
// Class for representing DXL scalar "is distinct from" comparison operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarDistinctComp_H
#define GPDXL_CDXLScalarDistinctComp_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalarComp.h"
namespace gpdxl
{
// indices of scalar distinct comparison elements in the children array
enum Edxlscdistcmp
{
EdxlscdistcmpIndexLeft = 0,
EdxlscdistcmpIndexRight,
EdxlscdistcmpSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLScalarDistinctComp
//
// @doc:
// Class for representing DXL scalar "is distinct from" comparison operators
//
//---------------------------------------------------------------------------
class CDXLScalarDistinctComp : public CDXLScalarComp
{
private:
public:
CDXLScalarDistinctComp(CDXLScalarDistinctComp &) = delete;
// ctor/dtor
CDXLScalarDistinctComp(CMemoryPool *mp, IMDId *operator_mdid);
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the DXL operator
const CWStringConst *GetOpNameStr() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLScalarDistinctComp *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarDistinct == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarDistinctComp *>(dxl_op);
}
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
return true;
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *node,
BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarDistinctComp_H
// EOF
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