[jira] [Commented] (FLINK-21566) Improve error message for "Unsupported casting"

["Jark Wu (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-21566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294239#comment-17294239 ] 

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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