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https://issues.apache.org/jira/browse/CALCITE-2619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16705683#comment-16705683
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Julian Hyde commented on CALCITE-2619:
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[~tedxu], I have made some modifications; see [my master
branch|https://github.com/julianhyde/calcite/commit/3e2bbede755eecfdb032c61d8f8a8779602ef6e3].
Can you please review and +1?
> 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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