[GitHub] [druid] rohangarg commented on issue #7953: Exact distinct-COUNT with complex expression (CASE, IN) throws NullPointerException

[GitBox <gi...@apache.org>]

rohangarg commented on issue #7953:
URL: https://github.com/apache/druid/issues/7953#issuecomment-979736033


   @julianhyde : I checked the issue you posted - CALCITE-3144 and I think it solves one of the two problems mentioned in this thread - of transforming a case statement to a filtered aggregator for optimized execution in some systems.
   
   But the other problem still remains, ie the following query still throws an error `SELECT COUNT(DISTINCT foo.dim1) FILTER(WHERE foo.cnt = 1), SUM(foo.cnt) FROM druid.foo` and explanation that Gian wrote above still hold according to me. Do you recall any reason for not making any changes in `AggregateExpandDistinctAggregatesRule`?


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