Github user Crystark commented on the pull request:
https://github.com/apache/storm/pull/374#issuecomment-105472684
On more thing i noticed:
[Column.hashCode](https://github.com/apache/storm/blob/master/external/storm-jdbc/src/main/java/org/apache/storm/jdbc/common/Column.java#L99)
doesn't support the value beeing null. I've tried using those columns as keys
of a HashMap and got a NPE.
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