greenplumn CParseHandlerColStatsBucket 源码
greenplumn CParseHandlerColStatsBucket 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/dxl/parser/CParseHandlerColStatsBucket.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2012 EMC Corp.
//
// @filename:
// CParseHandlerColStatsBucket.h
//
// @doc:
// SAX parse handler class for parsing a bucket of a column stats object
//---------------------------------------------------------------------------
#ifndef GPDXL_CParseHandlerColStatsBucket_H
#define GPDXL_CParseHandlerColStatsBucket_H
#include "gpos/base.h"
#include "naucrates/dxl/parser/CParseHandlerMetadataObject.h"
// fwd decl
namespace gpmd
{
class CMDIdColStats;
class CDXLBucket;
} // namespace gpmd
namespace gpdxl
{
using namespace gpos;
using namespace gpmd;
using namespace gpnaucrates;
XERCES_CPP_NAMESPACE_USE
// fwd decl
class CDXLDatum;
//---------------------------------------------------------------------------
// @class:
// CParseHandlerColStatsBucket
//
// @doc:
// Parse handler class for buckets of column stats objects
//
//---------------------------------------------------------------------------
class CParseHandlerColStatsBucket : public CParseHandlerBase
{
private:
// frequency
CDouble m_frequency;
// distinct values
CDouble m_distinct;
// lower bound value for the bucket
CDXLDatum *m_lower_bound_dxl_datum;
// upper bound value for the bucket
CDXLDatum *m_upper_bound_dxl_datum;
// is lower bound closed
BOOL m_is_lower_closed;
// is upper bound closed
BOOL m_is_upper_closed;
// dxl bucket object
CDXLBucket *m_dxl_bucket;
// 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:
CParseHandlerColStatsBucket(const CParseHandlerColStatsBucket &) = delete;
// ctor
CParseHandlerColStatsBucket(CMemoryPool *mp,
CParseHandlerManager *parse_handler_mgr,
CParseHandlerBase *parse_handler_base);
// dtor
~CParseHandlerColStatsBucket() override;
// returns the constructed bucket
CDXLBucket *GetDXLBucketAt() const;
};
} // namespace gpdxl
#endif // !GPDXL_CParseHandlerColStatsBucket_H
// EOF
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