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https://issues.apache.org/jira/browse/CALCITE-2730?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16714874#comment-16714874
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Zoltan Haindrich edited comment on CALCITE-2730 at 12/10/18 3:20 PM:
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[~zabetak] the issue is with the fact that in the presence of {{x>0}} the other
{{x>0}} is redundant. The issue happens in
[processRange|https://github.com/apache/calcite/blob/f3655e15a11a9fb266af290cb390e690d4301c09/core/src/main/java/org/apache/calcite/rex/RexSimplify.java#L1676]
- this part has it's own tricks...for now I think we might be fine if we
would ensure that AND/OR operands are free of comparision duplicates (we may
not compact: {{random(2) = 0 && random(2) = 0}} to {{random(2) = 0}} ).
was (Author: kgyrtkirk):
[~zabetak] the issue is with the fact that in the presence of {{x>0}} the other
{{x>0}} is redundant. The issue happens in
[processRange|https://github.com/apache/calcite/blob/f3655e15a11a9fb266af290cb390e690d4301c09/core/src/main/java/org/apache/calcite/rex/RexSimplify.java#L1676]
- this part has it's own issues...for now I think we might be fine if we
would ensure that AND/OR operands are free of duplicates (I think that would
not have any correctness issue).
> RelBuilder simplifies a filter with duplicate conjunction to empty
> ------------------------------------------------------------------
>
> Key: CALCITE-2730
> URL: https://issues.apache.org/jira/browse/CALCITE-2730
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: next
> Reporter: Stamatis Zampetakis
> Assignee: Julian Hyde
> Priority: Major
> Fix For: 1.18.0
>
>
> Regression from 1.17.
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