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125811: sql: add dynamic sample size max/min private settings and logging r=Uzair5162 a=Uzair5162 Logs the histogram sample size when it is determined dynamically. Also makes the bounds on the dynamic sample size computation configurable with private cluster settings. These are private for now since users should modify the `sql_stats_histogram_samples_count` table setting or `sql.stats.histogram_samples.count` cluster setting if they want custom sample sizes. See also: cockroachdb#123972 Release note: None Co-authored-by: Uzair Ahmad <[email protected]>
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