greenplumn CLeftOuterJoinStatsProcessor 源码
greenplumn CLeftOuterJoinStatsProcessor 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/statistics/CLeftOuterJoinStatsProcessor.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2018 VMware, Inc. or its affiliates.
//
// @filename:
// CLeftOuterJoinStatsProcessor.h
//
// @doc:
// Processor for computing statistics for Left Outer Join
//---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CLeftOuterJoinStatsProcessor_H
#define GPNAUCRATES_CLeftOuterJoinStatsProcessor_H
#include "naucrates/statistics/CJoinStatsProcessor.h"
namespace gpnaucrates
{
class CLeftOuterJoinStatsProcessor : public CJoinStatsProcessor
{
private:
// create a new hash map of histograms from the results of the inner join and the histograms of the outer child
static UlongToHistogramMap *MakeLOJHistogram(
CMemoryPool *mp, const CStatistics *outer_stats,
const CStatistics *inner_side_stats, CStatistics *inner_join_stats,
CStatsPredJoinArray *join_preds_stats, CDouble num_rows_inner_join,
CDouble *result_rows_LASJ);
// helper method to add histograms of the inner side of a LOJ
static void AddHistogramsLOJInner(CMemoryPool *mp,
const CStatistics *inner_join_stats,
ULongPtrArray *inner_colids_with_stats,
CDouble num_rows_LASJ,
CDouble num_rows_inner_join,
UlongToHistogramMap *LOJ_histograms);
public:
static CStatistics *CalcLOJoinStatsStatic(
CMemoryPool *mp, const IStatistics *outer_stats,
const IStatistics *inner_side_stats,
CStatsPredJoinArray *join_preds_stats);
};
} // namespace gpnaucrates
#endif // !GPNAUCRATES_CLeftOuterJoinStatsProcessor_H
// EOF
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