greenplumn CDXLScalarPartOid 源码
greenplumn CDXLScalarPartOid 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarPartOid.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2014 VMware, Inc. or its affiliates.
//
// @filename:
// CDXLScalarPartOid.h
//
// @doc:
// Class for representing DXL Part Oid expressions
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarPartOid_H
#define GPDXL_CDXLScalarPartOid_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLScalarPartOid
//
// @doc:
// Class for representing DXL Part Oid expressions
// These oids are created and consumed by the PartitionSelector operator
//
//---------------------------------------------------------------------------
class CDXLScalarPartOid : public CDXLScalar
{
private:
// partitioning level
ULONG m_partitioning_level;
public:
CDXLScalarPartOid(const CDXLScalarPartOid &) = delete;
// ctor
CDXLScalarPartOid(CMemoryPool *mp, ULONG partitioning_level);
// operator type
Edxlopid GetDXLOperator() const override;
// operator name
const CWStringConst *GetOpNameStr() const override;
// partitioning level
ULONG
GetPartitioningLevel() const
{
return m_partitioning_level;
}
// 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
{
return false;
}
#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
// conversion function
static CDXLScalarPartOid *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarPartOid == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarPartOid *>(dxl_op);
}
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarPartOid_H
// EOF
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