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https://issues.apache.org/jira/browse/CALCITE-3029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16828034#comment-16828034
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Stamatis Zampetakis commented on CALCITE-3029:
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OK sorry about that! Either me or [~rubenql] will look into this.
> Java-oriented field type is wrongly forced to be NOT NULL after being
> converted to SQL-oriented
> -----------------------------------------------------------------------------------------------
>
> Key: CALCITE-3029
> URL: https://issues.apache.org/jira/browse/CALCITE-3029
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.19.0
> Reporter: Hongze Zhang
> Assignee: Hongze Zhang
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> A Java-oriented field type loses its nullable constraint after calling method
> {{org.apache.calcite.jdbc.JavaTypeFactoryImpl#toSql(org.apache.calcite.rel.type.RelDataType)}}.
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