Github user HyukjinKwon commented on the pull request:
https://github.com/apache/spark/pull/8718#issuecomment-140569493
It look ok to JDBC datasource tough. I am wondering if conversion from
`NumericType` to `StringType` should be prevented or treated for each
differently as it looks unsafe for Parquet and ORC. For example, when column
`A` is string, `A >100' will push down a filter with string value performing
string comperison.
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