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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2017/05/16 15:36:04 UTC

[jira] [Commented] (CALCITE-1794) Simplify AND numeric comparisons when overlapping

    [ https://issues.apache.org/jira/browse/CALCITE-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012593#comment-16012593 ] 

Julian Hyde commented on CALCITE-1794:
--------------------------------------

I suggest doing this in terms of predicates (constraints). Both of the above examples notice that one predicate is stronger than another and discard the weaker one.

> Simplify AND numeric comparisons when overlapping
> -------------------------------------------------
>
>                 Key: CALCITE-1794
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1794
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Remus Rusanu
>
> Expressions such as {{$1<>1 and $1=2}} can be simplified to {{$1=2}}. Similar {{$1>10 AND $1>20}} can be simplified to {{$1>20}}. Such expressions are produced by the proposed solution for CALCITE-1790 (simplify boolean CASE to complex AND/OR).



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