Github user dilipbiswal commented on the issue:
https://github.com/apache/spark/pull/21174
@maropu So with the fix, if the query predicate contains an scalar subquery
expression, then that expression is not considered for partition pruning. For
example, if the predicate was , part_key1 = (select ...) and part_key2 = 5 ,
then only the 2nd part of the expression is considered for pruning purposes and
the first part will be a regular filter.
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