[jira] [Commented] (CALCITE-5639) RexSimplify should remove IS NOT NULL check when LIKE comparison is present

["Chunwei Lei (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17711168#comment-17711168 ] 

Chunwei Lei commented on CALCITE-5639:
--------------------------------------

I can't agree more. It would be great if we can find a more general solution.

> RexSimplify should remove IS NOT NULL check when LIKE comparison is present
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-5639
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5639
>             Project: Calcite
>          Issue Type: Bug
>    Affects Versions: 1.34.0
>            Reporter: Leonid Chistov
>            Assignee: Leonid Chistov
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Consider query like
> {code:java}
> select r_reason_desc from reason
> where r_reason_desc is not null and r_reason_desc like '%child%' 
> {code}
> where "r_reason_desc" is a nullable field.
> When RexSimplify::simplifyFilterPredicates is called on that conjunction of expressions, expression is not simplified, meaning that redundant  "is not null" check is not removed.
> In the same time, if query like 
> {code:java}
> select r_reason_desc from reason
> where r_reason_desc is not null and r_reason_desc >= 'A'{code}
> is passed to optimizer, redundant "is not null" check is eliminated.



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