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https://issues.apache.org/jira/browse/FLINK-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15190715#comment-15190715
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ramkrishna.s.vasudevan commented on FLINK-3579:
-----------------------------------------------
When we have f0 (VARCHAR) and f1(INTEGER), then
f0 + f1.cast(STRING) - works fine.
Similarly when we say 42.0.cast(INT) - this also works fine. But when we say
42.CAST(INT) or 42.CAST(STRING) then this fails.
> 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
> 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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