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https://issues.apache.org/jira/browse/SOLR-3160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215589#comment-13215589
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Luca Cavanna commented on SOLR-3160:
------------------------------------
Thanks Erick!
Catch is not mine, it comes from this [StackOverflow
question|http://stackoverflow.com/q/9368926/633239], I just reported the error
and worked on the patch.
> Division by zero in StatsComponent with date field always missing
> -----------------------------------------------------------------
>
> Key: SOLR-3160
> URL: https://issues.apache.org/jira/browse/SOLR-3160
> Project: Solr
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: Luca Cavanna
> Assignee: Erick Erickson
> Priority: Minor
> Fix For: 3.6, 4.0
>
> Attachments: SOLR-3160.patch
>
>
> Using the StatsComponent with a date field that never has a value you'll get
> {code}
> java.lang.ArithmeticException: / by zero at
> org.apache.solr.handler.component.DateStatsValues.addTypeSpecificStats
> (StatsValuesFactory.java:384)
> {code}
> The problem is in this line of DateStatsValues:
> {code}
> res.add("mean", new Date(sum / count));
> {code}
> If count is 0 the division throws ArithmeticException because sum is long
> here. This doesn't happen with NumericStatsValues because sum is double there
> and the division result is Nan.
> By the way, the result of those divisions is not even included in the output
> when count is 0 because of this condition in SimpleStats#getStatsFields:
> {code}
> if (isShard == true || (Long) stv.get("count") > 0) {
> res.add(f, stv);
> } else {
> res.add(f, null);
> }
> {code}
> Therefore, it should never throw an exception!
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