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https://issues.apache.org/jira/browse/DERBY-6751?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14159489#comment-14159489
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Knut Anders Hatlen commented on DERBY-6751:
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In the last few days, the performance regression tests have shown a significant
drop for primary key joins. See here:
http://home.online.no/~olmsan/derby/perf/joinprimarykey_30d.html
It seems to have started when the patch for this issue was committed. (The
other candidates were DERBY-6269 and DERBY-6748, but I find it unlikely that
they had any performance impact.)
The affected test uses {{org.apache.derbyTesting.perf.clients.Runner}} with
{{-load index_join}}.
The other load types in the regression tests seem unaffected, as far as I can
tell.
> Prevent user code from getting the LanguageConnectionContext from an
> EmbedConnection
> ------------------------------------------------------------------------------------
>
> Key: DERBY-6751
> URL: https://issues.apache.org/jira/browse/DERBY-6751
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.12.0.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Labels: derby_backport_reject_10_11
> Fix For: 10.12.0.0
>
> Attachments: derby-6751-01-aa-usederbyinternals.diff,
> derby-6751-01-ab-usederbyinternals.diff,
> derby-6751-01-ad-usederbyinternals.diff
>
>
> User code can cast a java.sql.Connection to an EmbedConnection and then get
> the LanguageConnectionContext by calling
> EmbedConnection.getLanguageConnection(). We should prevent user code from
> doing this.
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