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https://issues.apache.org/jira/browse/CALCITE-649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14385084#comment-14385084
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Julian Hyde commented on CALCITE-649:
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If it's an outer join you would need to know not just what conditions are left
but also which pair (or pairs) of inputs the conditions came from.
> Extend splitCondition method in RelOptUtil to support MultiJoin operator
> ------------------------------------------------------------------------
>
> Key: CALCITE-649
> URL: https://issues.apache.org/jira/browse/CALCITE-649
> Project: Calcite
> Issue Type: Bug
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
>
> Currently, we can only extract information from the condition of binary Join
> operators; the corresponding method in {{RelOptUtil}} should be generalized
> to support join with _n_ inputs.
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