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https://issues.apache.org/jira/browse/DERBY-6211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13646900#comment-13646900
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Mamta A. Satoor commented on DERBY-6211:
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Hi Rick, thanks for working on this useful addition to Derby. I was wondering
what were you planning on doing as part of following
**************************
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.
**************************
Recently, when I wrote couple optimizer related junit test, I was able to use
existing utilities to determine if the optimizer was choosing the correct scan
- InListMultiProbeTest:runThreeQueries
s.execute("call SYSCS_UTIL.SYSCS_SET_RUNTIMESTATISTICS(1)");
...
rtsp = SQLUtilities.getRuntimeStatisticsParser(s);
assertTrue(rtsp.usedIndexScan());
Are you planning on replacing this mechanism with something else? 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
>
>
> 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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