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https://issues.apache.org/jira/browse/DERBY-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12675956#action_12675956
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Bryan Pendleton commented on DERBY-2487:
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It seems like it would be nice if the result set number (a small integer,
identifying this
particular result set within this statement) were included as a column in
sys.sysxplain_resultsets. It is sometimes, but not always, included in
op_details currently.
> 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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