Re: [I] Questions about unaggregated variables and the usage of variables in GROUP BY [jena]

["afs (via GitHub)" <gi...@apache.org>]

afs commented on issue #3879:
URL: https://github.com/apache/jena/issues/3879#issuecomment-4372928795

   I think Q5 is a Jena bug. `?c` should be in-scope at the start of the SELECT expressions. It look like group keys are not checked properly.
   
   A simpler case of the bug is
   
   ```
   SELECT (3 AS ?z) WHERE {} GROUP BY ?z`
   ```
   


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