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https://issues.apache.org/jira/browse/CALCITE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16490346#comment-16490346
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Zoltan Haindrich commented on CALCITE-2247:
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I've opened CALCITE-2326 for the generalization; I currently thinking in that
this whole thing is not entirely about "unkownAsFalse" .... I feel that this
logic could be possibly implemented as some kind of distributive logic - but
that would probably add a lot of extra {{x IS NOT NULL}} -s
{code}
(p(x) and q(y)) is true => p(x) is true and q(y) is true
{code}
for the other uncovered issue I've opened: CALCITE-2327; I think that even thru
that's a small code change - it might cause changes in many tests/etc
https://github.com/apache/calcite/pull/688 is passing tests; I even tried it on
top of 2314 ; and it looked good to me
> 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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