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https://issues.apache.org/jira/browse/CALCITE-2190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373832#comment-16373832
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Jesus Camacho Rodriguez commented on CALCITE-2190:
--------------------------------------------------

[~julianhyde], could you review https://github.com/apache/calcite/pull/635 ? It 
is not a complete solution by any means, but it will help us solving the most 
common cases.

> Extend SubstitutionVisitor.splitFilter to cover different order of operands
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-2190
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2190
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>            Priority: Major
>
> {{SubstitutionVisitor.splitFilter}} does structural comparison to identify 
> relevant predicates. The method could sort the operands for some expressions 
> in a deterministic way to maximize possible matches.
> For instance, currently this example yields correct results:
> {code}
> condition: x = 1 or y = 2
> target:    y = 2 or x = 1
> -> residue:   true
> {code}
> However, the following equivalent example fails:
> {code}
> condition: x = 1 or y = 2
> target:    y = 2 or 1 = x
> {code}



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