greenplumn CDXLLogicalJoin 源码
greenplumn CDXLLogicalJoin 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/operators/CDXLLogicalJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2011 Greenplum, Inc.
//
// @filename:
// CDXLLogicalJoin.h
//
// @doc:
// Class for representing DXL logical Join operators
//
//---------------------------------------------------------------------------
#ifndef GPDXL_CDXLLogicalJoin_H
#define GPDXL_CDXLLogicalJoin_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLLogical.h"
namespace gpdxl
{
//---------------------------------------------------------------------------
// @class:
// CDXLLogicalJoin
//
// @doc:
// Class for representing DXL logical Join operators
//
//---------------------------------------------------------------------------
class CDXLLogicalJoin : public CDXLLogical
{
private:
// join type (inner, outer, ...)
EdxlJoinType m_join_type;
public:
CDXLLogicalJoin(CDXLLogicalJoin &) = delete;
// ctor/dtor
CDXLLogicalJoin(CMemoryPool *, EdxlJoinType);
// accessors
Edxlopid GetDXLOperator() const override;
const CWStringConst *GetOpNameStr() const override;
// join type
EdxlJoinType GetJoinType() const;
const CWStringConst *GetJoinTypeNameStr() const;
// serialize operator in DXL format
void SerializeToDXL(CXMLSerializer *xml_serializer,
const CDXLNode *node) const override;
// conversion function
static CDXLLogicalJoin *
Cast(CDXLOperator *dxl_op)
{
GPOS_ASSERT(nullptr != dxl_op);
GPOS_ASSERT(EdxlopLogicalJoin == dxl_op->GetDXLOperator());
return dynamic_cast<CDXLLogicalJoin *>(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_CDXLLogicalJoin_H
// EOF
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