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https://issues.apache.org/jira/browse/CALCITE-2626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16648059#comment-16648059
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Julian Hyde commented on CALCITE-2626:
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Good one. Do you have an illustrative test case?
> RelBuilder generates wrong field list for join
> ----------------------------------------------
>
> Key: CALCITE-2626
> URL: https://issues.apache.org/jira/browse/CALCITE-2626
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.17.0
> Reporter: Pavel Gubin
> Assignee: Julian Hyde
> Priority: Major
>
> When building OUTER JOIN RelBuilder doesn't change nullability of underlying
> fields just copying them as is. But with outer join fields shall become
> nullable at appropriate sides of join.
> The error is at these lines:
> https://github.com/apache/calcite/blob/fb7914ec61fc57c8348d9da144e2fbd608c00c61/core/src/main/java/org/apache/calcite/tools/RelBuilder.java#L1546
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