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Posted to issues@calcite.apache.org by "Ted Xu (JIRA)" <ji...@apache.org> on 2018/11/10 06:55:00 UTC

[jira] [Commented] (CALCITE-2619) Reduce string literal creation cost by removing unnecessary charset check

    [ https://issues.apache.org/jira/browse/CALCITE-2619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682246#comment-16682246 ] 

Ted Xu commented on CALCITE-2619:
---------------------------------

Thanks [~julianhyde], I opened another PR [https://github.com/apache/calcite/pull/911]. 

> Reduce string literal creation cost by removing unnecessary charset check
> -------------------------------------------------------------------------
>
>                 Key: CALCITE-2619
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2619
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: Ted Xu
>            Assignee: Julian Hyde
>            Priority: Major
>
> The cost of creating NlsString is very high, due to its charset check. In some cases, e.g., expression evaluate because of Partition Prune, the NlsString creation costs 40%+ of total executor's overhead.
>  



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