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https://issues.apache.org/jira/browse/CALCITE-2668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16685650#comment-16685650
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Jesus Camacho Rodriguez commented on CALCITE-2668:
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Pushed addendum in
[a36ffc35c|http://git-wip-us.apache.org/repos/asf/calcite/commit/a36ffc35c]
that deals with UnsupportedOperationException if we try to copy a node that is
not supported by RexCopier while backtracking a certain expression.
> 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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