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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