[jira] [Updated] (CALCITE-7807) Reuse unchanged SQL types during least-restrictive inference

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-7807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated CALCITE-7807:
------------------------------------
    Labels: pull-request-available  (was: )

> Reuse unchanged SQL types during least-restrictive inference
> ------------------------------------------------------------
>
>                 Key: CALCITE-7807
>                 URL: https://issues.apache.org/jira/browse/CALCITE-7807
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: Frank Chen
>            Priority: Major
>              Labels: pull-request-available
>
> Large string ARRAY validation repeatedly combines compatible character types. The least-restrictive path may call createTypeWithCharsetAndCollation even when the current immutable BasicSqlType already has the requested charset and collation.
> Return the existing BasicSqlType immediately when the requested charset and collation are unchanged. Requests that change either attribute retain the existing construction and canonicalization path.
> The isolated Druid benchmark reduced allocation by 9.05% at 100,000 string literals and 8.72% at 1,000,000 string literals.
> Pull request: [PR #5281|https://github.com/apache/calcite/pull/5281]



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