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https://issues.apache.org/jira/browse/CALCITE-2668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685701#comment-16685701
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Jesus Camacho Rodriguez commented on CALCITE-2668:
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[~julianhyde], I had been working on some Hive-Calcite items combined and I had
a fix for this issue that I had not pushed to Calcite, that is why I could
check it in immediately. There was no PR. If you feel it is not the right
solution, I can revert it / work on a new fix. About the
UnsupportedOperationException, I am not sure how to handle it right now and
avoiding getting the Exception, unless I implement the new logic in RexCopier
itself.
> Support for left/right outer join in RelMdExpressionLineage
> -----------------------------------------------------------
>
> Key: CALCITE-2668
> URL: https://issues.apache.org/jira/browse/CALCITE-2668
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Fix For: 1.18.0
>
>
> Currently, we bail out in the metadata provider if join operator is not of
> inner type. For left, right outer joins, we could track expressions generated
> from columns from the left, right inputs, respectively. In addition, if any
> of the columns in the join cannot be backtracked, we could still backtrack
> the origin of an expression if it is not using that column, and currently we
> bail out too.
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