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https://issues.apache.org/jira/browse/SOLR-8420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15073165#comment-15073165
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Tom Hill commented on SOLR-8420:
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Certainly could be changed. Looks like it currently would overflow if you are
looking at more than 6 million+ dates, which is a pretty small number today.
Downside is small loss of precision for smaller datasets.
I think it probably should be changed. I'll update the patch.
> Date statistics: sumOfSquares overflows long
> --------------------------------------------
>
> Key: SOLR-8420
> URL: https://issues.apache.org/jira/browse/SOLR-8420
> Project: Solr
> Issue Type: Bug
> Components: SearchComponents - other
> Affects Versions: 5.4
> Reporter: Tom Hill
> Priority: Minor
> Attachments: 0001-Fix-overflow-in-date-statistics.patch,
> 0001-Fix-overflow-in-date-statistics.patch, StdDev.java
>
>
> The values for Dates are large enough that squaring them overflows a "long"
> field. This should be converted to a double.
> StatsValuesFactory.java, line 755 DateStatsValues#updateTypeSpecificStats Add
> a cast to double
> sumOfSquares += ( (double)value * value * count);
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