Github user srowen commented on the issue:
https://github.com/apache/spark/pull/15032
I was double-checking this for my own understanding, and I see that
although these are all `Seq`s, that the default implementation is
`$colon$colon` and indeed it is a `List`.
I skimmed for other instances of this and found some possible matches in
`HiveInspectors` and `AggregationIterator`. Have a look. If they're the same
issue we should fix those too as the construction is there if anything for
'optimization' but if it only makes it slower, it should just use the simpler
functional idiom.
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