Github user squito commented on the issue:
https://github.com/apache/spark/pull/16781
@ueshin thanks for taking a look. Yes, that understanding is correct.
Another way to think about it is to compare those same operations with
different file formats, eg. textfile. Those work more like parquet does
*after* this patch. I had that explanation in a comment on the jira -- I just
updated the jira description to include it.
I'll address your comments, they also are making me take a closer look at a
couple of things. I should push an update tomorrow.
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