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https://issues.apache.org/jira/browse/DERBY-4116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689472#action_12689472
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Knut Anders Hatlen commented on DERBY-4116:
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With the latest patch, I think the row count estimate will always be set to 0
if you call SYSCS_UPDATE_STATISTICS on a table with no indexes, even if the
table is not empty. Would it be possible to initialize rowCount to -1, so that
we can detect that the row count was not calculated, and then add "if (rowCount
>= 0)" around the call to setEstimatedRowCount()?
> SYSCS_UTIL.SYSCS_UPDATE_STATISTICS should update the store estimated row
> count for the table
> --------------------------------------------------------------------------------------------
>
> Key: DERBY-4116
> URL: https://issues.apache.org/jira/browse/DERBY-4116
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.1.0, 10.6.0.0
> Reporter: Kathey Marsden
> Assignee: Kathey Marsden
> Attachments: derby-4116_diff.txt, derby-4116_diff2.txt
>
>
> When SYSCS_UTIL.SYSCS_UPDATE_STATISTICS is run, it doesn't update the store
> estimated row count. The program oldSelectivity.java attached to DERBY-3955
> shows that the statistics are not updated.
> See discussions in DERBY-3955
> https://issues.apache.org/jira/browse/DERBY-3955?focusedCommentId=12688789&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12688789
> https://issues.apache.org/jira/browse/DERBY-3955?focusedCommentId=12688813&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12688813
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