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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2487) Enhance Derby with EXPLAIN Functionality
Date Wed, 08 Apr 2009 15:43:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697064#action_12697064
] 

Bryan Pendleton commented on DERBY-2487:
----------------------------------------

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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