Division by zero in StatsComponent with date field always missing
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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: Luca Cavanna
Priority: Minor
Fix For: 3.6, 4.0
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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