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https://issues.apache.org/jira/browse/FLINK-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15223674#comment-15223674
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ASF GitHub Bot commented on FLINK-3579:
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Github user ramkrish86 commented on the pull request:
https://github.com/apache/flink/pull/1821#issuecomment-205139553
I have done the changes only to support the String concat operation. The
cast() and abs() grammar change looks more complex and I need to understand
things better in parser to support it. Suggest we do it in a seperate JIRA? Is
that fine @tillrohrmann ?
> 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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