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https://issues.apache.org/jira/browse/FLINK-21582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17294555#comment-17294555
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Jark Wu commented on FLINK-21582:
---------------------------------
I tested in SQL CLI and got the same result:
{code}
Flink SQL> select COALESCE(cast('aa' as int), 0);
+-----+-------------+
| +/- | EXPR$0 |
+-----+-------------+
| + | (NULL) |
+-----+-------------+
Received a total of 1 rows
Flink SQL> select COALESCE(NULL, 0);
+-----+-------------+
| +/- | EXPR$0 |
+-----+-------------+
| + | 0 |
+-----+-------------+
Received a total of 1 rows
{code}
> 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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