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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