arkguil commented on issue #22696: [SPARK-25708][SQL] HAVING without GROUP BY means global aggregate URL: https://github.com/apache/spark/pull/22696#issuecomment-490184967 @cloud-fan / @gatorsmile , just stumbled on this while investigating an issue with a query while migrating to 2.4... Seems like the fix over simplified the original intent. It should be totally ok to do something like `select id from range(10) having id > 5` Having is applied on the result of `select id from range(10)`, and since id is in the resultset, this should not fail with `grouping expressions sequence is empty, and '`id`' is not an aggregate function`. The previous SQL should be interpreted as `select id from range(10) group by id having id > 5` Which is what the previous plan was doing... This is easier to see when using a window function: `select id, max(id) over () as `max_id` from range(10) where id > 5 having max_id = id` The window will be generated then the filter applied on the result. You can't apply a where on `max_id` since it is only available after `select id, max(id) over () as `max_id` from range(10) where id > 5` is executed. Can you explain what this change fixes exactly?
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