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https://issues.apache.org/jira/browse/FLINK-3471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15159028#comment-15159028
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Ken Geis commented on FLINK-3471:
---------------------------------
There is current code in JDBCInputFormat that avoids Java nulls in Tuples by
using Flink's NullValue.getInstance().
> 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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