greenplumn CParseHandlerMDGPDBAgg 源码
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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