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https://issues.apache.org/jira/browse/CALCITE-7808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-7808:
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Labels: pull-request-available (was: )
> Cache recently created and decorated SQL types
> ----------------------------------------------
>
> Key: CALCITE-7808
> URL: https://issues.apache.org/jira/browse/CALCITE-7808
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Frank Chen
> Priority: Major
> Labels: pull-request-available
>
> RelDataTypeFactoryImpl canonicalizes types through a global weak interner,
> but canonicalization accepts an already constructed type. It therefore
> prevents equivalent types from being retained without preventing temporary
> BasicSqlType, charset wrapper, and type-digest allocation.
> Add bounded front-cache entries per SqlTypeName for the most recently created
> base type and decorated type. Cache misses retain the existing construction
> and canonicalization paths, and the global weak interner remains
> authoritative.
> The isolated Druid benchmark reduced allocation by 45.74% at 100,000 string
> literals and 44.70% at 1,000,000 string literals for the measured
> high-locality workload.
> Pull request: [PR #5282|https://github.com/apache/calcite/pull/5282]
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