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https://issues.apache.org/jira/browse/CALCITE-2247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16434548#comment-16434548
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Zoltan Haindrich commented on CALCITE-2247:
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When I've looked into RexImplicationChecker it looked like I will not be able
to get a rowType for it in every cases in which RexSimplify is being used.
The usage of predicates in RexSimplify seems to be a better way of doing this
than my existing approach; I think that probably the last case could also be
covered by examining the comparisions before simplifing more complex operands.
I'll take a look at it tomorrow :)
> 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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