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https://issues.apache.org/jira/browse/CALCITE-2897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Mior resolved CALCITE-2897.
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Resolution: Fixed
> Reduce expensive calls to Class#getSimpleName
> ---------------------------------------------
>
> Key: CALCITE-2897
> URL: https://issues.apache.org/jira/browse/CALCITE-2897
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.18.0
> Reporter: Stamatis Zampetakis
> Assignee: Stamatis Zampetakis
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Class#getSimpleName method performs string manipulation operations, among
> other things, which has a noticable impact on performance when called
> repeatedly. In various cases the calls to this method can be avoided easily
> by using precomputed fields.
> One place where this method really affects performance is in
> [RuleQueue#addMatch|https://github.com/apache/calcite/blob/92562a0f213fc1edc66e25f9c88e15bacb9085df/core/src/main/java/org/apache/calcite/plan/volcano/RuleQueue.java#L333].
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