Github user jaceklaskowski commented on the issue:
https://github.com/apache/spark/pull/20856
I spent over 2 days applying different modifications to the query hoping I
could cut the number of `CASE WHEN`s and other projections, but noticed no
correlation between the number or their "types". I'll see if renaming the
columns leads to the issue and submit a test case. Thanks for your support!
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