greenplumn CParseHandlerWindowSpec 源码
greenplumn CParseHandlerWindowSpec 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerWindowSpec.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerWindowSpec.h
//
// @doc:
// SAX parse handler class for parsing the window specification
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerWindowSpec_H
#define GPDXL_CParseHandlerWindowSpec_H
#include "gpos/base.h"
#include "naucrates/dxl/operators/CDXLWindowSpec.h"
#include "naucrates/dxl/parser/CParseHandlerBase.h"
#include "naucrates/dxl/xml/dxltokens.h"
namespace gpdxl
{
using namespace gpos;
XERCES_CPP_NAMESPACE_USE
//---------------------------------------------------------------------------
// @class:
// CParseHandlerWindowSpec
//
// @doc:
// SAX parse handler class for parsing the window specification
//
//---------------------------------------------------------------------------
class CParseHandlerWindowSpec : public CParseHandlerBase
{
private:
// array of partition-by column identifiers used by the window functions
ULongPtrArray *m_part_by_colid_array;
// window specification generated by the parser
CDXLWindowSpec *m_dxl_window_spec_gen;
// name of window specification
CMDName *m_mdname;
// does the window spec have a frame definition
BOOL m_has_window_frame;
// 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:
CParseHandlerWindowSpec(const CParseHandlerWindowSpec &) = delete;
// ctor
CParseHandlerWindowSpec(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_root);
// window specification generated by the parse handler
CDXLWindowSpec *
GetWindowKeyAt() const
{
return m_dxl_window_spec_gen;
}
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerWindowSpec_H
// EOF
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