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https://issues.apache.org/jira/browse/CALCITE-7807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7807:
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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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