greenplumn CParseHandlerMDGPDBAgg 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerMDGPDBAgg.h
/---------------------------------------------------------------------------
/ Greenplum Database
/ Copyright (C) 2011 EMC Corp.
/
/ @filename:
/ CParseHandlerMDGPDBAgg.h
/
/ @doc:
/ SAX parse handler class for GPDB aggregate metadata
/---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerMDGPDBAgg_H
#define GPDXL_CParseHandlerMDGPDBAgg_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataObject.h"
#include "naucrates/md/CMDAggregateGPDB.h"
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
XERCES_CPP_NAMESPACE_USE
/---------------------------------------------------------------------------
/ @class:
/ CParseHandlerMDGPDBAgg
/
/ @doc:
/ Parse handler for GPDB aggregate metadata
/
/---------------------------------------------------------------------------
class CParseHandlerMDGPDBAgg : public CParseHandlerMetadataObject
{
private:
/ metadata id comprising of id and version info.
IMDId *m_mdid;
/ name
CMDName *m_mdname;
/ result type
IMDId *m_mdid_type_result;
/ intermediate result type
IMDId *m_mdid_type_intermediate;
/ is aggregate ordered
BOOL m_is_ordered;
/ is aggregate splittable
BOOL m_is_splittable;
/ can we use hash aggregation to compute agg function
BOOL m_hash_agg_capable;
/ 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:
CParseHandlerMDGPDBAgg(const CParseHandlerMDGPDBAgg &) = delete;
/ ctor
CParseHandlerMDGPDBAgg(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
};
} / namespace gpdxl
#endif / !GPDXL_CParseHandlerMDGPDBAgg_H
/ EOF
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