Github user rdblue commented on the issue:
https://github.com/apache/spark/pull/21556
@HyukjinKwon, even if the values are null, the makeEq function only casts
null to Java Integer so the handling is still safe. It just looks odd that
`null.asInstanceOf[JInt]` is safe. Thanks to @wangyum for explaining it. Even
if the null-safe equality predicate contains a null value, this should be safe.
And, passing null in an equals predicate is supported by Parquet.
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