greenplumn CParseHandlerNLJoin 源码
greenplumn CParseHandlerNLJoin 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerNLJoin.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2010 Greenplum, Inc.
//
// @filename:
// CParseHandlerNLJoin.h
//
// @doc:
// SAX parse handler class for parsing nested loop join operator nodes.
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerNLJoin_H
#define GPDXL_CParseHandlerNLJoin_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLPhysicalNLJoin.h"
#include "naucrates/dxl/parser/CParseHandlerPhysicalOp.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
// indices of nested loop join elements in the children array
enum ENLJoinParseHandlerChildIndices
{
EdxlParseHandlerNLJIndexProp = 0,
EdxlParseHandlerNLJIndexProjList,
EdxlParseHandlerNLJIndexFilter,
EdxlParseHandlerNLJIndexJoinFilter,
EdxlParseHandlerNLJIndexLeftChild,
EdxlParseHandlerNLJIndexRightChild,
EdxlParseHandlerNLJIndexNestLoopParams,
EdxlParseHandlerNLJIndexSentinel
};
//---------------------------------------------------------------------------
// @class:
// CParseHandlerNLJoin
//
// @doc:
// Parse handler for nested loop join operators
//
//---------------------------------------------------------------------------
class CParseHandlerNLJoin : public CParseHandlerPhysicalOp
{
private:
// the nested loop join operator
CDXLPhysicalNLJoin *m_dxl_op;
// process the start of an element
void StartElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname, // element's qname
const Attributes &attr // element's attributes
) override;
// process the end of an element
void EndElement(
const XMLCh *const element_uri, // URI of element's namespace
const XMLCh *const element_local_name, // local part of element's name
const XMLCh *const element_qname // element's qname
) override;
public:
CParseHandlerNLJoin(const CParseHandlerNLJoin &) = delete;
// ctor/dtor
CParseHandlerNLJoin(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerNLJoin_H
// EOF
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