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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-2487) Enhance Derby with EXPLAIN Functionality
Date Tue, 24 Feb 2009 02:50:01 GMT

    [ https://issues.apache.org/jira/browse/DERBY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12676158#action_12676158
] 

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

I need to investigate how this should work in an upgrade scenario. Is there already
code which runs during upgrade which would detect that these system tables do
not yet exist, and would create them? Also, is there anything special needed so that,
if the system tables do not yet exist, then the feature is smart enough to not allow
itself to be turned on until the system tables are created (e.g., in "soft" upgrade)?

> 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,
RSProtocolNew.pdf, rts.xls, small logical xplain schema.pdf, startRegressionTest.diff, startRegressionTest.diff,
updateRegressionTests.diff, updateRegressionTests.diff, usage.txt, 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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