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https://issues.apache.org/jira/browse/FLINK-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159045#comment-15159045
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Chesnay Schepler commented on FLINK-3471:
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that is specifically for columns that are always NULL. that may not make a lot
of sense in the real world, but back then i just went down the list of SQL
types and created a reasonable mapping.
you can't throw a NullValue into a tuple field whose type is not NullValue.
even assuming a compiler would let that through, it would fail the moment a
serializer touches the tuple.
> JDBCInputFormat cannot handle null fields of certain types
> ----------------------------------------------------------
>
> Key: FLINK-3471
> URL: https://issues.apache.org/jira/browse/FLINK-3471
> Project: Flink
> Issue Type: Bug
> Affects Versions: 0.10.2
> Reporter: Ken Geis
>
> JDBCInputFormat.addValue(..) is not safe against NULL values for types
> DECIMAL, NUMERIC, DATE, TIME, TIMESTAMP, and SQLXML. This makes it so that I
> cannot input data using any queries that will result in NULL values for any
> of these types.
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