Github user TomaszGaweda commented on the issue:
https://github.com/apache/spark/pull/21360
@viirya I've written it in the ticket. In my case, pushing down ORs with
non-equality predicates caused DB2 to slow down; workaround was to cache data
before filtering, it was approx. 10 times faster. This PR is to enable
possibility to decide that you don't want to push down predicate without caching
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