Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/1439#issuecomment-49386783
@chenghao-intel I did not meant to introduce multiple `HiveTableScan`. I
meant to have a abstract `TableScan` and make existing ones (e.g.
`HiveTableScan` and `ParquetTableScan`) be subclasses of the abstract
`TableScan`.
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