greenplumn CDXLPhysicalMergeJoin 源码
greenplumn CDXLPhysicalMergeJoin 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLPhysicalMergeJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLPhysicalMergeJoin.h
//
// @doc:
// Class for representing DXL merge join operators.
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLPhysicalMergeJoin_H
#define GPDXL_CDXLPhysicalMergeJoin_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysicalJoin.h"
namespace gpdxl
{
// indices of merge join elements in the children array
enum Edxlmj
{
EdxlmjIndexProjList = 0,
EdxlmjIndexFilter,
EdxlmjIndexJoinFilter,
EdxlmjIndexMergeCondList,
EdxlmjIndexLeftChild,
EdxlmjIndexRightChild,
EdxlmjIndexSentinel
};
//---------------------------------------------------------------------------
// @class:
// CDXLPhysicalMergeJoin
//
// @doc:
// Class for representing DXL merge operators
//
//---------------------------------------------------------------------------
class CDXLPhysicalMergeJoin : public CDXLPhysicalJoin
{
private:
// true if outer relation has unique values for the merge key
BOOL m_is_unique_outer;
public:
CDXLPhysicalMergeJoin(const CDXLPhysicalMergeJoin &) = delete;
// ctor
CDXLPhysicalMergeJoin(CMemoryPool *mp, EdxlJoinType join_type,
BOOL is_unique_outer);
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *dxlnode) const override;
// conversion function
static CDXLPhysicalMergeJoin *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopPhysicalMergeJoin == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLPhysicalMergeJoin *>(dxl_op);
}
#ifdef GPOS_DEBUG
// checks whether the operator has valid structure, i.e. number and
// types of child nodes
void AssertValid(const CDXLNode *, BOOL validate_children) const override;
#endif // GPOS_DEBUG
};
} // namespace gpdxl
#endif // !GPDXL_CDXLPhysicalMergeJoin_H
// EOF
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