Github user HyukjinKwon commented on the pull request: https://github.com/apache/spark/pull/10750#issuecomment-171513363 If we keep going to solve in `DataSourceStrategy` in this way, I think we should resolve the operators for other datasources. For this, dealing with `Cast` [SPARK-9182](https://issues.apache.org/jira/browse/SPARK-9182) might have to be done first.
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