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From "Kristian Waagan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5684) Explore possible istat daemon improvements and optimizations
Date Wed, 16 May 2012 13:37:02 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5684?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13276733#comment-13276733
] 

Kristian Waagan commented on DERBY-5684:
----------------------------------------

DW>> What scenario corresponds to this latter case below (irg == null):?
KW> I don't remember... I'll remove irg == null and see if I added it because a test fell
over (I think so, but maybe I had a bug somewhere else that caused this behavior). 

I added the following code to the ConglomerateDescriptor  constructor and ran suites.All (indexable
and indexRowGenerator are both declared as final):
+        if (indexable && indexRowGenerator == null) {
+            throw new IllegalStateException("irg is null, indexable is true");
+        }

I didn't see any test failures, so my conclusion is that the check in IndexStatisticsAnalyzer
can be dropped.
                
> Explore possible istat daemon improvements and optimizations
> ------------------------------------------------------------
>
>                 Key: DERBY-5684
>                 URL: https://issues.apache.org/jira/browse/DERBY-5684
>             Project: Derby
>          Issue Type: Task
>            Reporter: Kristian Waagan
>         Attachments: derby-istat-exploration-1.diff, derby-istat-exploration-2.diff,
derby-istat-exploration.diff
>
>
> A task tracking some experiments on the istat daemon and the statistics update code.

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