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https://issues.apache.org/jira/browse/FLINK-21582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17298030#comment-17298030
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Jark Wu commented on FLINK-21582:
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Hi [~twalthr], I agree throwing exception is a more standard compliant
behavior. However, it is on purpose to return NULL in Flink SQL to avoid
runtime exception for a long running job. There are also many other functions
returning NULL when processing invalid input.
> COALESCE not works when cast a variable return null
> ---------------------------------------------------
>
> Key: FLINK-21582
> URL: https://issues.apache.org/jira/browse/FLINK-21582
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.11.1
> Environment: Flink1.11.1
>
> Reporter: Jerry
> Priority: Minor
> Attachments: image-2021-03-03-19-48-21-306.png
>
>
> select COALESCE(cast('aa' as int), 0);return NULL
> select COALESCE(NULL, 0); return 0
> The first case works failed, but the second case works successful
>
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