317brian commented on code in PR #13185:
URL: https://github.com/apache/druid/pull/13185#discussion_r988437434


##########
docs/multi-stage-query/known-issues.md:
##########
@@ -40,7 +40,7 @@ an [UnknownError](./reference.md#error-codes) with a message 
including "No space
 - SELECT from a Druid datasource does not include unpublished real-time data.
 
 - GROUPING SETS and UNION ALL are not implemented. Queries using these 
features return a
-  [QueryNotSupported](reference.md#error-codes) error.
+  [QueryNotSupported](reference.md#error-codes) error. For some COUNT DISTINCT 
queries, the planner attempts to use GROUPING SETS, which causes the following 
exception: `Must not have 'subtotalsSpec'`.

Review Comment:
   Thanks for the clarification! I'll push a new commit with some changes



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