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

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

gianm commented on issue #7953: Exact distinct-COUNT with complex expression (CASE, IN) throws NullPointerException
URL: https://github.com/apache/incubator-druid/issues/7953#issuecomment-508864855
 
 
   I've reduced this test case to the simplest query I can find that still triggers the NPE:
   
   ```sql
   SELECT COUNT(DISTINCT foo.dim1) FILTER(WHERE foo.cnt = 1) - SUM(foo.cnt) FROM druid.foo
   ```
   
   If I remove the DISTINCT, or the first FILTER, or the SUM, then the query runs OK. The issue seems to be some interaction between the three. By the way, the same NPE gets hit regardless of whether the second aggregator is a SUM or MAX.

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