Github user adrian-ionescu commented on the issue:
https://github.com/apache/spark/pull/18979
Thanks for the fix and tests, @steveloughran!
Re 1. -- is there a need for calling `getFinalStats()` more than once? The
function doc clearly states that it's not supported and may lead to undefined
behaviour. Could be fixed, of course, but depending on the implementation of
the stats tracker, that can be at the expense of additional memory or code
complexity..
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