Github user hvanhovell commented on the pull request:

    https://github.com/apache/spark/pull/12720#issuecomment-215330406
  
    This is an example that will fail if we pull out predicates in the 
optimizer (`min(b.value)` does not resolve):
    ```sql
    select b.key, min(b.value)
    from src b
    group by b.key
    having exists ( select a.key
                    from src a
                    where a.value > 'val_9' and a.value = min(b.value)
                    )
    ```
    To make this work here I need use both the `Aggregate` and its child during 
the resolution of the outer references; I want to address this in a follow-up.


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