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https://issues.apache.org/jira/browse/FLINK-13490?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu resolved FLINK-13490.
-----------------------------
       Resolution: Fixed
    Fix Version/s:     (was: 1.10.0)
                   1.9.1

master: 69a91e8f8eb36c2f429fd1ae14fc5217fe3e3190
1.9.1: 82667a816f31d20da93eb4464d01fc9fe2fb1bc5

> Fix return null in JDBCUtils::getFieldFromResultSet
> ---------------------------------------------------
>
>                 Key: FLINK-13490
>                 URL: https://issues.apache.org/jira/browse/FLINK-13490
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Connectors / JDBC
>            Reporter: Caizhi Weng
>            Assignee: Caizhi Weng
>            Priority: Critical
>             Fix For: 1.9.1
>
>
> The null checking in `JDBCUtils::getFieldFromResultSet` is incorrect. Under 
> the current implementation, if one column is null in the result set, the 
> following calls to this method using the same result set will always return 
> null, no matter what the content of the column is.



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