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https://issues.apache.org/jira/browse/DERBY-837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461955#comment-13461955
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Mamta A. Satoor commented on DERBY-837:
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Hi Brian, sorry, I looked through my code and don't have the prototype in my
codeline.
> Enable optimizer trace in Derby
> -------------------------------
>
> Key: DERBY-837
> URL: https://issues.apache.org/jira/browse/DERBY-837
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 10.2.1.6
> Reporter: Mamta A. Satoor
>
> Derby engine has code to produce trace for optimization phase ie various
> plans considered by the optimizer for a query. This trace however does not
> get produced because there is no way to turn the trace on. When someone does
> work on providing a way to enable the optimizer trace, we will also need to
> decide in what format this trace should be presented. Further information on
> this issue can be found at
> http://article.gmane.org/gmane.comp.apache.db.derby.devel/12288
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