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https://issues.apache.org/jira/browse/FLINK-24385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17452537#comment-17452537
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Marios Trivyzas commented on FLINK-24385:
-----------------------------------------
Adjust docs on *ExecutionConfigOptions.TABLE_EXEC_LEGACY_CAST_BEHAVIOUR* to
mention this major behavioural change.
> Add TRY_CAST function to be able to handle errors
> -------------------------------------------------
>
> Key: FLINK-24385
> URL: https://issues.apache.org/jira/browse/FLINK-24385
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / API
> Reporter: Marios Trivyzas
> Assignee: Marios Trivyzas
> Priority: Major
>
> Currently, *CAST* is returning null when the conversion requested fails,
> whereas normally in SQL it would just throw an error. Maybe it would be
> better to change the implementation of *CAST* to throw errors on failed
> conversions, and introduce *TRY_CAST* which would return null in such cases.
> Then with a simple wrapping of a *TRY_CAST* expression with *COALESCE* the
> user can also use an alternative default value to be returned instead of
> null. e..g:
> {{}}{{SELECT COALESCE(TRY_CAST(col1 AS INT), -1) FROM test}}
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