Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/5488#issuecomment-93043798
This is not a bug, this is [the intended
behavior](https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/jdbc/JDBCRelation.scala#L57).
I think the right fix here is to update the programming guide and other
documentation to clearly state this. If users want to limit the scope of the
data, they should add predicates which will be pushed down to the database.
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