julianhyde commented on issue #7953: Exact distinct-COUNT with complex expression (CASE, IN) throws NullPointerException URL: https://github.com/apache/incubator-druid/issues/7953#issuecomment-505121858 I agree, and the crack is probably in Calcite. `IN` is a good place to look, because it often causes problems - we have to remember to do a particular rewrite to expand it. I'm curious that the expression has been internally rewritten to `COUNT(DISTINCT $2) FILTER $3`. I don't remember that rewrite going into Calcite. (It's a good one, though.)
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