Github user aray commented on the issue:
https://github.com/apache/spark/pull/18786
No the changes to `summary` are not additive, it inserts 25%, 50%, and 75%
percentiles before max (the last row). People that want the previous behavior
can use `describe`. Or if they are trying to programmatically access these
fields they should really be explicitly specifying an aggregation. If you
recall we discussed using the summary name in the original PR
https://github.com/apache/spark/pull/18307#issuecomment-312347948
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