You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues-all@impala.apache.org by "Kurt Deschler (Jira)" <ji...@apache.org> on 2021/08/03 15:12:00 UTC

[jira] [Commented] (IMPALA-10836) Add simplify cast rule

    [ https://issues.apache.org/jira/browse/IMPALA-10836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17392357#comment-17392357 ] 

Kurt Deschler commented on IMPALA-10836:
----------------------------------------

#1 should be limited to cases that will not result in output changes.

> Add simplify cast rule
> ----------------------
>
>                 Key: IMPALA-10836
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10836
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Frontend
>            Reporter: Xianqing He
>            Assignee: Xianqing He
>            Priority: Major
>             Fix For: Impala 4.1.0
>
>
> For the function cast we can add the following optimizations:
>  # Removes the inner case conversion expressions that are unnecessary, e.g. cast(cast(col as int) as string) => cast(col as string)
>  # Removes unnecessary cast when the input is already the correct type, e.g. col is bigint, cast(col as bigint) => col



--
This message was sent by Atlassian Jira
(v8.3.4#803005)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-all-unsubscribe@impala.apache.org
For additional commands, e-mail: issues-all-help@impala.apache.org