gianm commented on issue #7957: Druid SQL planning time can exceed query 
timeouts
URL: 
https://github.com/apache/incubator-druid/issues/7957#issuecomment-505497428
 
 
   Timeouts are checked at various points in the query lifecycle (not 
continuously) so it does make sense that this can happen. Currently, the main 
points they're checked are:
   
   - On historicals during query processing, depending on query engine and 
algorithm used, either between every row or between every segment
   - On the broker, when it's reading data from historicals
   
   Might be nice to add timeout checking in a few more places. However, for the 
specific issue in #7904, it probably wouldn't be interruptible since it's 
spinning inside Calcite code on something algorithmically excessive. That 
algorithmic excessiveness should just be fixed in Calcite itself and then the 
newer version of Calcite pulled into Druid.

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