Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/21187
> "In-any-subquery in Pivot can be implemented like what we did in the
other parts", can you make this clearer? The Pivot's "IN" values are special
coz they will later become the columns of the relation.
Yes. The In subquery needs to be executed before/during query analysis
stage. Thus, it is different.
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