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https://issues.apache.org/jira/browse/CALCITE-2669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesus Camacho Rodriguez resolved CALCITE-2669.
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Resolution: Fixed
Fixed in
[fcc8bf7f4|http://git-wip-us.apache.org/repos/asf/calcite/commit/fcc8bf7f4].
> RelMdTableReferences should check whether references inferred from input are
> null for Union/Join operators
> ----------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2669
> URL: https://issues.apache.org/jira/browse/CALCITE-2669
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Fix For: 1.18.0
>
>
> Currently, there is no check and we iterate directly over the set returned,
> which may lead to a NPE if there is an operator underneath that is not
> supported.
> https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/metadata/RelMdTableReferences.java#L111
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