Jackie-Jiang opened a new pull request, #14620:
URL: https://github.com/apache/pinot/pull/14620

   On top of #14618
   
   One of the bottleneck for combining group-by results is to grow the 
`IndexedTable` as we are adding groups. To reduce the re-hashing, we can 
initialize it with a larger capacity:
   - The size of `IndexedTable` won't go over `trimThreshold`
   - The size of `IndexedTable` should at least be able to hold the groups from 
the first map to be merged
   - Allow user to config a min capacity by query option or instance config


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