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From "Rick Hillegas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6211) Make Optimizer trace logic pluggable.
Date Mon, 06 May 2013 12:50:20 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13649713#comment-13649713
] 

Rick Hillegas commented on DERBY-6211:
--------------------------------------

Thanks for catching that, Knut. I think this may mean that OptimizerTracer needs to move out
of the tools jar and into the engine jar. The right thing might be to move all of the optional
tools into the engine jar since none of them really needs to be in the tools jar. Dag wondered
about this in a 2013-01-03 comment on DERBY-6022. For the moment I will just move OptimizerTracer
and see if that helps. Thanks.
                
> Make Optimizer trace logic pluggable.
> -------------------------------------
>
>                 Key: DERBY-6211
>                 URL: https://issues.apache.org/jira/browse/DERBY-6211
>             Project: Derby
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 10.11.0.0
>            Reporter: Rick Hillegas
>            Assignee: Rick Hillegas
>         Attachments: derby-6211-01-aa-createPlugin.diff, derby-6211-02-aa-cleanup.diff,
derby-6211-02-ab-cleanup.diff, derby-6211-03-aa-customTracer.diff
>
>
> Right now the trace logic in the optimizer is hard-coded to produce a stream of diagnostics.
It would be good to be able to plug alternative trace logic into the optimizer. This would
make the following possible:
> 1) Plug in trace logic which produces formats which are easier to study and which can
be analyzed mechanically. E.g., xml formatted output.
> 2) Plug in trace logic which can be used during unit testing to verify that the optimizer
has picked the right plan. Over time this might make it easier to migrate canon-based tests
to assertion-based tests.

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