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https://issues.apache.org/jira/browse/CALCITE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16454385#comment-16454385
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Julian Hyde commented on CALCITE-2247:
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Glad this is working out for you. I like the idea of two passes better than
sorting, because it is deterministic. One thing to be watch out for: that
during pass 1 we generate a constraint from term 1 to simply term 2, and during
pass 2 we generate a constraint from term 2 that we use to simplify term 1.
There seems to be a danger of circular reasoning, so please make sure that
doesn't happen.
I look forward to reviewing this change.
> Add rule to push in condition condition into a related disjunctive expression
> -----------------------------------------------------------------------------
>
> Key: CALCITE-2247
> URL: https://issues.apache.org/jira/browse/CALCITE-2247
> Project: Calcite
> Issue Type: Improvement
> Reporter: Zoltan Haindrich
> Assignee: Zoltan Haindrich
> Priority: Major
>
> Simplify expressions like: {code}a = 1 AND (a = 1 OR a = 2){code} to {code}a
> = 1{code}
> Conditions to apply will be:
> * in an AND condition there exists a comparison(c) and an OR (o)
> * o and c only reference 1 variable
> See HIVE-19097 for more info.
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