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Posted to issues@calcite.apache.org by "Stamatis Zampetakis (JIRA)" <ji...@apache.org> on 2019/03/06 10:17:00 UTC

[jira] [Created] (CALCITE-2897) Reduce expensive calls to Class#getSimpleName

Stamatis Zampetakis created CALCITE-2897:
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             Summary: 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
             Fix For: 1.19.0


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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