Github user maropu commented on the issue:
https://github.com/apache/spark/pull/21070
@rdblue [I made the input test date sorted
(clustered)](https://github.com/maropu/spark/blob/dfb6f3bad10058b28ff66a6d2b72225b8847296c/sql/core/src/test/scala/org/apache/spark/sql/FilterPushdownBenchmark.scala#L77)
though, I didn't get a luck in the string case;
https://gist.github.com/maropu/b7ff6d528547de03a4a5cbabd120e78d
I'm still looking into why (I welcome any suggestion).
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