FrankChen021 commented on PR #20314:
URL: https://github.com/apache/druid/pull/20314#issuecomment-5692904985

   > @FrankChen021 Nice find on the [performance 
regression](https://github.com/apache/druid/issues/20326#issuecomment-5664833172)
   > 
   > Do you think it's still worthwhile to have a planning timeout? I think it 
still could be valuable in order to prevent heap exhaustion under heavy query 
load with large in-clauses
   
   May be useful as a protection mechansim that queries with long planning time 
do not overwhelm the system. Since the underlying Calcite problem has been 
resolved, now I can't figure out under which cases there will be such problem. 
   I think one more important thing is that we need performance regression test 
for each PR so that we can know and solve any performance regression before 
it's merge into the master branch.


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