[jira] [Commented] (DERBY-6211) Make Optimizer trace logic pluggable.

["Rick Hillegas (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-6211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13680556#comment-13680556 ] 

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

Tests passed cleanly for me on derby-6211-05-aa-xmlOptimizerTracer.diff. Committed at subversion revision 1491893.

JIRA was not reachable when I committed this patch. It appears that the "ASF subversion and git services" commit trigger does not buffer up and retry a commit comment if it fails to add the comment immediately after committing.
                
> 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, derby-6211-04-aa-moveOptimizerTracerToEngineJar.diff, derby-6211-05-aa-xmlOptimizerTracer.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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