[jira] [Commented] (CALCITE-604) Invoke metadata providers via MethodHandle rather than reflection

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15106069#comment-15106069 ] 

Julian Hyde commented on CALCITE-604:
-------------------------------------

Work in progress at https://github.com/julianhyde/calcite/tree/604-tune-metadata.

> Invoke metadata providers via MethodHandle rather than reflection
> -----------------------------------------------------------------
>
>                 Key: CALCITE-604
>                 URL: https://issues.apache.org/jira/browse/CALCITE-604
>             Project: Calcite
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>
> JDK 1.7 introduced http://docs.oracle.com/javase/7/docs/api/java/lang/invoke/MethodHandle.html, a more efficient way to invoke methods. Access control etc. is done when the handle is created, not each invocation.
> Currently calls to metadata providers are dispatched via reflection (Method.invoke, see ReflectiveRelMetadataProvider, ChainedRelMetadataProvider and CachingInvocationHandler), and I suspect that planning a complex query (especially with tracing enabled) makes millions of calls. Moving to MethodHandle would improve performance.



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