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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6211) Make Optimizer trace logic pluggable.
Date Wed, 12 Jun 2013 19:10:20 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681526#comment-13681526
] 

ASF subversion and git services commented on DERBY-6211:
--------------------------------------------------------

Commit 1492378 from [~rhillegas]
[ https://svn.apache.org/r1492378 ]

DERBY-6211: Commit derby-6211-06-ab-packageProtect-XMLOptTrace.diff, reducing the visibility
of XMLOptTrace.
                
> 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, derby-6211-06-ab-packageProtect-XMLOptTrace.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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