Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21070
@maropu, I'd recommend looking at the Parquet files using
[`parquet-cli`](http://search.maven.org/#search%7Cga%7C1%7Ca%3A%22parquet-cli%22)
to see if you're getting reasonable min/max stats for your string columns.
That will give you an idea of when predicate push-down will help.
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