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https://issues.apache.org/jira/browse/SOLR-9104?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15487560#comment-15487560
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Markus Jelsma commented on SOLR-9104:
-------------------------------------
This are slightly different now, i don't know if this is important. This index
functions as an autocompleter with EdgeNGram and it appears zero results is not
key to the problem.
{code}
select?omitHeader=true&indent=true&wt=json&fl=query&fq={!collapse
field=query_digest}&fq={!collapse field=result_digest}&q=query:organi
{code}
Yields:
{code}
{
"response":{"numFound":5,"start":0,"docs":[
{
"query":"organisatiestructuur"},
{
"query":"organigram"},
{
"query":"organisatieschema"},
{
"query":"organisatie"},
{
"query":"organisatiebureau"}]
}}
{code}
The second result, organigram is the problem here. If i add a g to the query
the result should yield organigram only.
{code}
select?omitHeader=true&indent=true&wt=json&fl=query&fq={!collapse
field=query_digest}&fq={!collapse field=result_digest}&q=query:organig
{code}
I now get the NPE again (on Solr 6.1)
{code}
{
"error":{
"trace":"java.lang.NullPointerException\n\tat
org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:813)\n\tat
org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:850)\n\tat
org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:275)\n\tat
org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1810)\n\tat
org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1627)\n\tat
org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:643)\n\tat
org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:529)\n\tat
org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:293)\n\tat
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:156)\n\tat
org.apache.solr.core.SolrCore.execute(SolrCore.java:2036)\n\tat
org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:657)\n\tat
org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:464)\n\tat
{code}
Any idea how not having zero results is changing the problem?
> NPE in CollapsingQParser when two fq={!collapse} and zero results
> -----------------------------------------------------------------
>
> Key: SOLR-9104
> URL: https://issues.apache.org/jira/browse/SOLR-9104
> Project: Solr
> Issue Type: Bug
> Affects Versions: 6.0
> Reporter: Markus Jelsma
> Fix For: 6.2, master (7.0)
>
>
> This is a very weird problem that is reproducible on a small production
> server, but not on the local machine although they run the same 6.0 version.,
> and have an almost identical index. The only minor difference is that
> production is a SolrCloud with 1 shard and two replica's, just for a bit of
> redundancy.
> The following query yields zero results and throws the NPE:
> {code}
> select?q=query:seis&fq={!collapse field=query_digest}&fq={!collapse
> field=result_digest}
> {code}
> The next query does yield results and does not throw anything, it just works
> as it should work:
> {code}
> select?q=query:seiz&fq={!collapse field=query_digest}&fq={!collapse
> field=result_digest}
> {code}
> The /select handler used does not add any fancy param other than rows.
> Here's the NPE:
> {code}
> 2016-05-11 14:10:27.666 ERROR (qtp1209271652-3338) [c:suggestions s:shard1
> r:core_node1 x:suggestions_shard1_replica1] o.a.s.s.HttpSolrCall
> null:java.lang.NullPointerException
> at
> org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:814)
> at
> org.apache.solr.search.CollapsingQParserPlugin$IntScoreCollector.finish(CollapsingQParserPlugin.java:851)
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:272)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1794)
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1611)
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:634)
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:529)
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:287)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:155)
> {code}
> Edit: for the sake of clarity. It really needs double fq={!collapse bla bla
> for the NPE to appear. If i remove either of the filters from the query, i
> get a nice zero resultset back. Both fields are defined as int.
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