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https://issues.apache.org/jira/browse/CALCITE-649?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14384429#comment-14384429
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Jesus Camacho Rodriguez commented on CALCITE-649:
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[~julianhyde], I used the same method interface that was used for binary join, 
but for multijoin. Thus, the behavior is the same that we had for binary joins; 
we return the conditions that are left. I don't know if that answers your 
question?

> 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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