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| Class Summary | |
|---|---|
| AnnotateStatsProcCtx | |
| AnnotateWithStatistics | |
| StatsRulesProcFactory | |
| StatsRulesProcFactory.DefaultStatsRule | Default rule is to aggregate the statistics from all its parent operators. |
| StatsRulesProcFactory.FilterStatsRule | FILTER operator does not change the average row size but it does change the number of rows emitted. |
| StatsRulesProcFactory.GroupByStatsRule | GROUPBY operator changes the number of rows. |
| StatsRulesProcFactory.JoinStatsRule | JOIN operator can yield any of the following three cases The values of join keys are disjoint in both relations in which case T(RXS) = 0 (we need histograms for this) Join key is primary key on relation R and foreign key on relation S in which case every tuple in S will have a tuple in R T(RXS) = T(S) (we need histograms for this) Both R & S relation have same value for join-key. |
| StatsRulesProcFactory.LimitStatsRule | LIMIT operator changes the number of rows and thereby the data size. |
| StatsRulesProcFactory.SelectStatsRule | SELECT operator doesn't change the number of rows emitted from the parent operator. |
| StatsRulesProcFactory.TableScanStatsRule | Collect basic statistics like number of rows, data size and column level statistics from the table. |
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