gianm opened a new pull request, #17810:
URL: https://github.com/apache/druid/pull/17810

   When a nil clusterBy is used, we have no way of achieving a particular 
target size, so we need to fall back to a "mix" spec (unsorted single 
partition).
   
   This comes up for queries like `SELECT COUNT(*) FROM FOO LIMIT 1` when 
results use a target size, such as when we are inserting into another table or 
when we are writing to durable storage.


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