albertobastos opened a new pull request, #15278:
URL: https://github.com/apache/pinot/pull/15278

   Adds a warning log trace when the number of groups in a group-by operator 
exceeds a certain threshold.
   
   It is based on a new `num.groups.limit.default.warn.factor` Server 
configuration parameter with `1.5` as default value. When a group by operator 
detects that more than `default num.groups.limit * 
num.groups.limit.default.warn.factor` groups exist for a segment, it will emit 
a warning message such as:
   
   ```
   WARN ... [qid=xxx] numGroups reached warning limit: 150000 (actual: 197312).
   ```


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