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https://issues.apache.org/jira/browse/DERBY-4849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12920958#action_12920958
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Kristian Waagan commented on DERBY-4849:
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Hi Bryan,
Knut and I have briefly discussed this offline, and we came to the same
conclusion as you.
I said I would write a patch for it, but you're free to take over if you want
to :)
In any case, I'll run the test with the index stats prototype and the patch.
Writing a reliable regression test for this seems tricky. Any ideas?
> Re-compilation may cause duplicate entries in the XPLAIN table
> --------------------------------------------------------------
>
> Key: DERBY-4849
> URL: https://issues.apache.org/jira/browse/DERBY-4849
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.2.1, 10.7.0.0
> Reporter: Kristian Waagan
> Priority: Minor
> Attachments: derby-4849-xplain_duplicate_stacktrace.txt
>
>
> If happening at the right moment, a re-compilation request may cause
> duplicate entries in the XPLAIN statement tables.
> I have only confirmed this for the SYSXPLAIN_STATEMENTS table, and I do not
> know if the other XPLAIN tables are affected.
> The error is highly intermittent, and so far I have only been able to trigger
> it when testing the automatic index statistics update prototype.
> See the attached stack-trace for some more details.
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