jnturton commented on issue #2693:
URL: https://github.com/apache/drill/issues/2693#issuecomment-1337217929

   This feels like a bit of a blind spot in MySQL to me. [The docs 
say](https://dev.mysql.com/doc/refman/5.7/en/group-by-handling.html) that since 
5.7.5 MySQL has detected functional dependence of expressions on the grouped 
columns when ONLY_FULL_GROUP_BY is _enabled_. Yet the null ordering expression 
`foo is null` generated by Calcite is certainly funtionally dependent on `foo` 
and it still gets rejected.


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