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https://issues.apache.org/jira/browse/CALCITE-929?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967780#comment-14967780
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Jesus Camacho Rodriguez commented on CALCITE-929:
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[~julianhyde], I created a pull request:
https://github.com/apache/incubator-calcite/pull/158
It's a very simple fix, but since this was introduced in CALCITE-792, could you
take a look? Thanks
> Calls to AbstractRelNode may result in NPE
> ------------------------------------------
>
> Key: CALCITE-929
> URL: https://issues.apache.org/jira/browse/CALCITE-929
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.5.0-incubating
>
>
> Calls to methods {{isDistinct}} and {{isKey}} may result in NPE if the value
> return by the metadata provider is null.
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