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https://issues.apache.org/jira/browse/SOLR-5416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13868310#comment-13868310
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Joel Bernstein commented on SOLR-5416:
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Actually the reason why I had to disable the QueryResultCache for the
CollapsingQParserPlugin is this bug. You could trigger this bug by also doing
1) Executing a query with the CollapsingQParsePlugin combined with facets.
2) The query gets cached in the QueryResultCache. But the docset does not (this
is normal for Solr).
3) Execute the same query again, retrieve the query from the QueryResultCache
but the docset needs to be regenerated.
4) Regenerating the docset threw the same exception you reported in this ticket
because they use the same method.
I knew this bug existed, so I disabled the queryResultCache for the
CollapsingQParserPlugin. But I didn't know tag/exclude would trigger the same
bug. You pointed that out.
Now that this issue is fixed, the CollapsingQParserPlugin will work fine with
the QueryResultCache. But I haven't re-enabled it. If you want, you can create
another ticket for that. I was planning on doing this for Solr 4.7.
> CollapsingQParserPlugin breaks Tag/Exclude Faceting
> ---------------------------------------------------
>
> Key: SOLR-5416
> URL: https://issues.apache.org/jira/browse/SOLR-5416
> Project: Solr
> Issue Type: Bug
> Components: search
> Affects Versions: 4.6
> Reporter: David
> Assignee: Joel Bernstein
> Labels: group, grouping
> Fix For: 5.0, 4.6.1
>
> Attachments: CollapseQParserPluginPatch-solr-4.5.1.patch,
> CollapsingQParserPlugin.java, SOLR-5416.patch, SOLR-5416.patch,
> SOLR-5416.patch, SOLR-5416.patch, SOLR-5416.patch, SOLR-5416.patch,
> SolrIndexSearcher.java, TestCollapseQParserPlugin.java
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> Trying to use CollapsingQParserPlugin with facet tagging throws an exception.
> {code}
> ModifiableSolrParams params = new ModifiableSolrParams();
> params.add("q", "*:*");
> params.add("fq", "{!collapse field=group_s}");
> params.add("defType", "edismax");
> params.add("bf", "field(test_ti)");
> params.add("fq","{!tag=test_ti}test_ti:5");
> params.add("facet","true");
> params.add("facet.field","{!ex=test_ti}test_ti");
> assertQ(req(params), "*[count(//doc)=1]",
> "//doc[./int[@name='test_ti']='5']");
> {code}
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