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https://issues.apache.org/jira/browse/FLINK-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15198735#comment-15198735
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ramkrishna.s.vasudevan commented on FLINK-3579:
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Okie. This time I can see the JIRA getting updated with the PR.
> Improve String concatenation
> ----------------------------
>
> Key: FLINK-3579
> URL: https://issues.apache.org/jira/browse/FLINK-3579
> Project: Flink
> Issue Type: Bug
> Components: Table API
> Reporter: Timo Walther
> Assignee: ramkrishna.s.vasudevan
> Priority: Minor
>
> Concatenation of a String and non-String does not work properly.
> e.g. {{f0 + 42}} leads to RelBuilder Exception
> ExpressionParser does not like {{f0 + 42.cast(STRING)}} either.
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