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https://issues.apache.org/jira/browse/LUCENE-2785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12965192#action_12965192
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Uwe Schindler commented on LUCENE-2785:
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bq. So... IndexSearcher.search (the one that sorts by score) throws an EXC if
numHits is 0... Maybe... we should do the same for the sort-by-field case?
I think IndexSearcher should not only throw the exception, in my opinion the
create() method in TSDC and TFDC should also check this and throw the
exception? A lot of people, also solr are instantiating the collectors
themselves (although not recommeneded, because they dont know the correct
booleans passed in).
+1 for TSDC and TFDC throw exception if hitcount <1
bq. And, also make this new Collector that only counts hits? The exception
message can then point users to this new Collector?
+1 to the new collector that simply counts. I have such a collector also
sometimes in my code. Misusing TFDC or TSDC is wrong and uses too much
resources.
> TopFieldCollector throws AIOOBE if numHits is 0
> -----------------------------------------------
>
> Key: LUCENE-2785
> URL: https://issues.apache.org/jira/browse/LUCENE-2785
> Project: Lucene - Java
> Issue Type: Bug
> Components: Search
> Reporter: Michael McCandless
> Priority: Minor
> Fix For: 3.1, 4.0
>
>
> See solr-user thread "ArrayIndexOutOfBoundsException for query with rows=0
> and sort param".
> I think we should just create a null collector (only tallies up totalHits) if
> numHits is 0?
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