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https://issues.apache.org/jira/browse/SOLR-8807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188192#comment-15188192
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Joel Bernstein commented on SOLR-8807:
--------------------------------------
Wondering if the spellchecker is enabling the early termination collector. It
appears that not all the segments are being visited in the search that is being
executed. I'll dig into the spellchecker and see what I can find.
> NPE during spell checking when result collapsing is activated and index got
> more than one segment.
> --------------------------------------------------------------------------------------------------
>
> Key: SOLR-8807
> URL: https://issues.apache.org/jira/browse/SOLR-8807
> Project: Solr
> Issue Type: Bug
> Components: spellchecker
> Affects Versions: 5.4
> Environment: Solr 5.4 with an index cosisting of two segments
> Reporter: Christian Danninger
> Priority: Critical
> Labels: collapse, spellcheck
>
> When using spellchecker with collapse/expand results, I got an NPE. Only
> happend when the index consists of more than one segment.
> {code}
> 11:30:33,505 WARN [org.apache.solr.spelling.SpellCheckCollator]
> (http-/0.0.0.0:8080-2) Exception trying to re-query to check if a spell check
> possibility would return any hits.: java.lang.NullPointerException
> at
> org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:631)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.finish(CollapsingQParserPlugin.java:681)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.search.SolrIndexSearcher.buildAndRunCollectorChain(SolrIndexSearcher.java:213)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListNC(SolrIndexSearcher.java:1672)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1491)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:557)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:525)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.spelling.SpellCheckCollator.collate(SpellCheckCollator.java:147)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.handler.component.SpellCheckComponent.addCollationsToResponse(SpellCheckComponent.java:238)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.handler.component.SpellCheckComponent.process(SpellCheckComponent.java:203)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:281)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:156)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:2073)
> [solr-core-5.4.0.jar:5.4.0 1718046 - upayavira - 2015-12-04 23:16:46]
> {code}
> {code}
> <requestHandler name="/select" class="solr.SearchHandler">
> <arr name="last-components">
> <str>spellchecker</str>
> </arr>
> </requestHandler>
> {code}
> The query parameters are:
> {code}
> "spellcheck.maxCollations": "5",
> "q.op": "AND",
> "fq": "{!collapse field=type}",
> "spellcheck.maxCollationTries": "10",
> "spellcheck.collateMaxCollectDocs": "100000",
> "spellcheck.alternativeTermCount": "10",
> "spellcheck.extendedResults": "true",
> "spellcheck.dictionary": [
> "dest_wordbreak",
> "dest_fuzzy"
> ],
> "q": "kosamui thailand",
> "defType": "edismax",
> "expand": "true",
> "spellcheck.maxResultsForSuggest": "3",
> "qf": "country_name region_name",
> "spellcheck": "true",
> "spellcheck.accuracy": "0.5",
> "spellcheck.count": "20",
> "spellcheck.collate": "true",
> {code}
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