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https://issues.apache.org/jira/browse/FLINK-21582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17295872#comment-17295872
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jibiyr edited comment on FLINK-21582 at 3/5/21, 2:13 PM:
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[~twalthr] [~jark]
I debug and found the coalesce function is parsed to *case-when*,because the
sqlType's nullable of CAST REXCALL is false
,so the case-when result is *cast('aa' as int) not null*,however the CAST
ExprCodeGen resultTerm is null.
I think if the nullable of cast('aa' as int) can be true.
was (Author: yr):
[~twalthr] [~jark]
I debug and found the coalesce function is parsed to *case-when*,because the
sqlType's nullable of CAST REXCALL is false
,so the case-when result is *cast('aa' as int) not null*,however the CAST
ExprCodeGen resultTerm is null.
I think the nullable of cast('aa' as int) should be true.
> 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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