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Posted to dev@calcite.apache.org by "Evgeny Stanilovsky (Jira)" <ji...@apache.org> on 2023/05/16 05:44:00 UTC

[jira] [Created] (CALCITE-5703) Reduce amount of generated runtime code

Evgeny Stanilovsky created CALCITE-5703:
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             Summary: Reduce amount of generated runtime code
                 Key: CALCITE-5703
                 URL: https://issues.apache.org/jira/browse/CALCITE-5703
             Project: Calcite
          Issue Type: Improvement
          Components: core
    Affects Versions: 1.34.0
            Reporter: Evgeny Stanilovsky
            Assignee: Evgeny Stanilovsky


In some cases runtime generates code like :
{noformat}
return case_when_value == null ? (String) null : some_oparation();
or
return input_value == null ? (Long) null : Long.valueOf(...;
{noformat}
this redundant casting probably not harmful, but there is another side - maximum method size, this size jdk[1], janino [2] throws : *Code grows beyond 64 KB* . This PR reduces code generated by calcite runtime thus more huge expressions could be executed.

[1] https://github.com/openjdk/jdk/blob/d22bcc813eea719b817d3d541a843594675c0ca9/src/jdk.compiler/share/classes/com/sun/tools/javac/jvm/ClassFile.java#L101
[2] https://github.com/janino-compiler/janino/blob/e69022f5aaabd36edc08a2074360d62514493a19/janino/src/main/java/org/codehaus/janino/CodeContext.java#L699



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