greenplumn CDXLScalarSortCol 源码
greenplumn CDXLScalarSortCol 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLScalarSortCol.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLScalarSortCol.h
//
// @doc:
// Class for representing sorting column info in DXL Sort and Motion nodes.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLScalarSortCol_H
#define GPDXL_CDXLScalarSortCol_H
#include "gpos/base.h"
#include "naucrates/dxl/gpdb_types.h"
#include "naucrates/dxl/operators/CDXLScalar.h"
#include "naucrates/md/IMDId.h"
namespace gpdxl
{
using namespace gpmd;
//---------------------------------------------------------------------------
// @class:
// CDXLScalarSortCol
//
// @doc:
// Sorting column info in DXL Sort and Motion nodes
//
//---------------------------------------------------------------------------
class CDXLScalarSortCol : public CDXLScalar
{
private:
// id of the sorting column
ULONG m_colid;
// catalog Oid of the sorting operator
IMDId *m_mdid_sort_op;
// name of sorting operator
CWStringConst *m_sort_op_name_str;
// sort nulls before other values
BOOL m_must_sort_nulls_first;
public:
CDXLScalarSortCol(CDXLScalarSortCol &) = delete;
// ctor/dtor
CDXLScalarSortCol(CMemoryPool *mp, ULONG colid, IMDId *sort_op_id,
CWStringConst *pstrTypeName, BOOL fSortNullsFirst);
~CDXLScalarSortCol() override;
// ident accessors
Edxlopid GetDXLOperator() const override;
// name of the operator
const CWStringConst *GetOpNameStr() const override;
// Id of the sorting column
ULONG GetColId() const;
// mdid of the sorting operator
IMDId *GetMdIdSortOp() const;
// whether nulls are sorted before other values
BOOL IsSortedNullsFirst() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *, const CDXLNode *) const override;
// conversion function
static CDXLScalarSortCol *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopScalarSortCol == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLScalarSortCol *>(dxl_op);
}
// does the operator return a boolean result
BOOL
HasBoolResult(CMDAccessor * //md_accessor
) const override
{
GPOS_ASSERT(!"Invalid function call for this operator");
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
};
} // namespace gpdxl
#endif // !GPDXL_CDXLScalarSortCol_H
// EOF
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