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https://issues.apache.org/jira/browse/SOLR-8807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15188139#comment-15188139
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Joel Bernstein commented on SOLR-8807:
--------------------------------------
Are you sure this is related to the spellchecker? Does the collapse query work
if the spellchecker is turned off?
> 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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