Jefffrey commented on issue #4874:
URL: 
https://github.com/apache/arrow-datafusion/issues/4874#issuecomment-1404198980

   This seems to be a SQLite specific feature: 
https://sqlite.org/lang_select.html#bare_columns_in_an_aggregate_query
   
   Specifically:
   
   > Most other SQL database engines disallow bare columns. If you include a 
bare column in a query, other database engines will usually raise an error. The 
ability to include bare columns in a query is an SQLite-specific extension.
   
   Indeed when I try the same query (`select id, max(id) max_id from users`) on 
Postgres I get an error:
   
   > SQL Error [42803]: ERROR: column "users.id" must appear in the GROUP BY 
clause or be used in an aggregate function
   
   And I believe this project mainly uses Spark/Postgres as reference for 
implementation.


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