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https://issues.apache.org/jira/browse/FLINK-31336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17697406#comment-17697406
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Jark Wu commented on FLINK-31336:
---------------------------------

Could you help to investigate what's the behavior in other systems, such as 
Postgres? 

> interval type process has problem in table api and sql
> ------------------------------------------------------
>
>                 Key: FLINK-31336
>                 URL: https://issues.apache.org/jira/browse/FLINK-31336
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Planner
>    Affects Versions: 1.18.0
>            Reporter: jackylau
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.18.0
>
>
> {code:java}
> // code placeholder
> select typeof(interval '1' day);
>  - INTERVAL SECOND(3) NOT NULL {code}
>  



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