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https://issues.apache.org/jira/browse/CALCITE-2701?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-2701:
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Summary: Ensure that the "Baz" classes generated by Janino are thread-safe
(was: Make instances of generated Baz classes immutable)
> Ensure that the "Baz" classes generated by Janino are thread-safe
> -----------------------------------------------------------------
>
> Key: CALCITE-2701
> URL: https://issues.apache.org/jira/browse/CALCITE-2701
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.17.0
> Reporter: Stamatis Zampetakis
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.18.0
>
>
> Currently the Baz classes that are used to execute queries in the
> EnumerableConvention are stateful since the code generated by
> EnumerableRelImplementor#implementRoot method creates an instance variable
> (i.e., DataContext root). Every call to the bind method changes the value of
> the root variable making the object mutable.
> I propose to remove the instance variable and in the body of the method use
> the DataContext passed as a parameter.
> It appears that the addition of the instance variable was a workaround for a
> bug in Janino (JANINO-169). It seems that the bug is no longer present at the
> current version of Janino used in Calcite (3.0.9) since the test
> JdbcTest#testJanino169 (and the complete suite) pass successfully with the
> proposed modification.
> Unfortunately, I couldn't verify the fix in the release notes of Janino
> neither in the commit history. The best, I could find is the following
> commits in the Janino repository:
> {code:none}
> commit fe5edc1904278c1c189f3379e06417aaf4a26315
> Author: aunkrig <aunkrig@eb4544d6-894b-0410-9319-a9612837a279>
> Date: Wed Jan 22 21:19:48 2014 +0000
> Partly fixed JANINO-169 - now you get "Compiler limitation: Initializers
> cannot access local variables declared in an enclosing block".
> commit 4d2bacf16229ac1278eafa0fb4d5a0377134d3f2
> Author: aunkrig <aunkrig@eb4544d6-894b-0410-9319-a9612837a279>
> Date: Wed Jan 22 15:03:17 2014 +0000
> Added test case for JANINO-169.
> {code}
>
>
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