greenplumn CGroupByStatsProcessor 源码
greenplumn CGroupByStatsProcessor 代码
文件路径：/src/backend/gporca/libnaucrates/include/naucrates/statistics/CGroupByStatsProcessor.h
//---------------------------------------------------------------------------
// Greenplum Database
// Copyright (C) 2018 VMware, Inc. or its affiliates.
//
// @filename:
// CGroupByStatsProcessor.h
//
// @doc:
// Compute statistics for group by operation
//---------------------------------------------------------------------------
#ifndef GPNAUCRATES_CGroupByStatsProcessor_H
#define GPNAUCRATES_CGroupByStatsProcessor_H
#include "gpopt/optimizer/COptimizerConfig.h"
#include "naucrates/statistics/CStatistics.h"
#include "naucrates/statistics/CStatisticsUtils.h"
namespace gpnaucrates
{
class CGroupByStatsProcessor
{
public:
// group by
static CStatistics *CalcGroupByStats(CMemoryPool *mp,
const CStatistics *input_stats,
ULongPtrArray *GCs,
ULongPtrArray *aggs, CBitSet *keys);
};
} // namespace gpnaucrates
#endif // !GPNAUCRATES_CGroupByStatsProcessor_H
// EOF
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