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https://issues.apache.org/jira/browse/CALCITE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489957#comment-16489957
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Julian Hyde commented on CALCITE-2247:
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{quote}I think that refactor/generalization of the unknown handling should be
done in a separate ticket;{quote}
I agree. Can you log a ticket, please?
{quote}I would be intrested in looking into it...{quote}
That would be great.
{quote}after CALCITE-2314 it would be probably safer to do...since it adds a
lot of checks.{quote}
Yes, but CALCITE-2314 is like lint - it will find existing flaws but it won't
break anything - so don't wait for it before starting work.
{quote}Are there any more things which are needed to be done before this ticket
could go in?{quote}
I don't think so. If all tests pass, and there is a ticket logged for things we
know to be broken, we're good to go.
> Add rule to push conditions 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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