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https://issues.apache.org/jira/browse/DERBY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697064#action_12697064
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Bryan Pendleton commented on DERBY-2487:
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Rick, I'm getting ready to have a go at the re-factoring of the visitor pattern
as you suggested.
I think this is the last major re-working of the patch that should be needed,
after which we
should be ready for more detailed review. I hope to have that version of the
patch ready
before too long.
> Enhance Derby with EXPLAIN Functionality
> ----------------------------------------
>
> Key: DERBY-2487
> URL: https://issues.apache.org/jira/browse/DERBY-2487
> Project: Derby
> Issue Type: New Feature
> Components: SQL
> Affects Versions: 10.2.2.0
> Reporter: Felix Beyer
> Assignee: Bryan Pendleton
> Priority: Minor
> Attachments: Derby physical XPLAIN schema.png,
> incorporateTrunkChanges.diff, removeSourceDepth.diff, RSProtocolNew.pdf,
> rts.xls, small logical xplain schema.pdf, startRegressionTest.diff,
> startRegressionTest.diff, startUpgradeTests.diff, updateRegressionTests.diff,
> updateRegressionTests.diff, usage.txt, userSchemaPrototyping.diff,
> userSchemaPrototyping.diff, userSchemaPrototyping.diff, xplain_patch_v1.txt,
> xplainClasses.pdf
>
>
> This enhancement extends Derby with EXPLAIN functions. Users want to have
> more feedback than they`re getting with the current RuntimeStatistics
> facility. This extension is based on the
> RuntimeStatistics/ResultSetStatistics functions / classes.
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