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msq: update known issue about GROUPING SETS and COUNT DISTINCT (#13185) 

* msq: update known issue about GROUPING SETS and COUNT DISTINCT

* address feedback from Gian
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317brian 2022-10-05 19:47:03 -07:00 committed by GitHub
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docs/multi-stage-query/known-issues.md
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@ -42,6 +42,8 @@ an [UnknownError](./reference.md#error-codes) with a message including "No space
- GROUPING SETS and UNION ALL are not implemented. Queries using these features return a
[QueryNotSupported](reference.md#error-codes) error.
- For some COUNT DISTINCT queries, you'll encounter a [QueryNotSupported](reference.md#error-codes) error that includes `Must not have 'subtotalsSpec'` as one of its causes. This is caused by the planner attempting to use GROUPING SETs, which are not implemented.
- The numeric varieties of the EARLIEST and LATEST aggregators do not work properly. Attempting to use the numeric
varieties of these aggregators lead to an error like
`java.lang.ClassCastException: class java.lang.Double cannot be cast to class org.apache.druid.collections.SerializablePair`.