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https://issues.apache.org/jira/browse/FLINK-21566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294239#comment-17294239
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Jark Wu commented on FLINK-21566:
---------------------------------
Improving error messages is always good. However, currently the "Unsupported
casting" exception is thrown during code generation where the code location
information is lost.
> Improve error message for "Unsupported casting"
> -----------------------------------------------
>
> Key: FLINK-21566
> URL: https://issues.apache.org/jira/browse/FLINK-21566
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / API
> Affects Versions: 1.12.1
> Reporter: Nico Kruber
> Priority: Major
>
> In a situation like from FLINK-21565, neither the error message {{Unsupported
> casting from TINYINT to INTERVAL SECOND(3)}}, nor the exception trace (see
> FLINK-21565) gives you a good hint on where the error is, especially if you
> have many statements with TINYINTs or operations on these.
> The query parser could highlight the location of the error inside the SQL
> statement that the user provided.
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