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https://issues.apache.org/jira/browse/DERBY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12693936#action_12693936
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Bryan Pendleton commented on DERBY-2487:
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Thanks Rick for the review and comments -- this is quite helpful!
I'm definitely in the midst of converting the code from the prior system-table
approach
to the new user-table approach, so I'm not surprised you found that part of the
patch
baffling. I'll continue to work on this, and will also give some thought to the
other suggestions
you made, and hopefully I'll be back before too long with a more complete and
working proposal.
> 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,
> 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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