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https://issues.apache.org/jira/browse/CALCITE-996?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092628#comment-15092628
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Jesus Camacho Rodriguez commented on CALCITE-996:
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[~julianhyde], [~vlsi], catching up with this one.
I updated the pull request and added an additional test in RelBuilder.
https://github.com/apache/calcite/pull/171
> FilterMergeRule should simplify the merged condition
> ----------------------------------------------------
>
> Key: CALCITE-996
> URL: https://issues.apache.org/jira/browse/CALCITE-996
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.5.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.6.0
>
>
> When we call FilterMergeRule, there is a high probability that we end up with
> duplicate predicate factors. It seems appropriate to simplify the predicate
> to eliminate those factors before we create the merged filter.
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