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https://issues.apache.org/jira/browse/FLINK-28368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17561985#comment-17561985
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Jark Wu commented on FLINK-28368:
---------------------------------

It's by design. Nullability is a part of data type in Flink. 

> Get field type return result problem
> ------------------------------------
>
>                 Key: FLINK-28368
>                 URL: https://issues.apache.org/jira/browse/FLINK-28368
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / API
>         Environment: flink1.14.x+iceberg0.13.1
>            Reporter: hunter
>            Priority: Minor
>         Attachments: 1.png, 2.png
>
>
> When I use resolved Schema.get Column Data Types(), I expect it to return the 
> types of all fields, but it returns the nullable of the field type. I don't 
> know if it's a design flaw, or I Problems caused during use



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