//---------------------------------------------------------------------------
//	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;

	// is aggregate replicate slice safe for execution
	BOOL m_is_repsafe;

	// 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