Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/8718#issuecomment-140693582
It is OK for JDBC but for Parquet and ORC, it looks the conversion from
`StringType` to `NumericType` are not safe.
When the field type is `StringType`, then the given numeric value is
converted to `String` and it compares both as string which ends up in wrong
comparison.
Also, it looks sometimes `Cast()` fails when trying to cast unrealistic
values. So, it returns false when it fails just in case.
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