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POApache Solr: bitwise operations to filter search results
 

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    <p>I need to filter solr search results corresponding the access rights in our cms (drupal 7 + custom access control mechanism based on bitmasks).</p> <p>There exists a Solr QParserPlugin plugin for search results filtering based on bitwise operations on integer fields: <a href="https://issues.apache.org/jira/browse/SOLR-1913" rel="nofollow">https://issues.apache.org/jira/browse/SOLR-1913</a>.</p> <p>I am using Solr 3.6.1 (+ the plugin in /var/lib/tomcat6/solr/lib/bitwise_filter_plugin.jar) on tomcat6 (on debian system) with the <a href="http://drupalcode.org/project/search_api_solr.git/blob/3e6fda7:/solrconfig.xml" rel="nofollow">schema.xml</a> provided by the drupal module search_api_solr and the solrconfig.xml found in the modules issue queue (extended as indicated in the SOLR-1913 issue).</p> <p>The Solr query ...</p> <pre><code>http://solr:8080/solr/select?qf=t_title&amp;fl=*,score&amp;fq={!bitwise field=is_bitmask op=AND source=1234}* </code></pre> <p>... fails with the following message in the error log:</p> <pre><code>Sep 27, 2012 8:57:41 AM org.apache.solr.core.SolrCore execute INFO: [] webapp=/solr path=/select params={qf=t_title&amp;fl=*,score&amp;fq={!bitwise+field%3Dis_bitmask+op%3DAND+source%3D1234}} status=500 QTime=15 Sep 27, 2012 8:57:41 AM org.apache.solr.common.SolrException log SEVERE: java.lang.NullPointerException at org.apache.lucene.search.FilteredQuery.hashCode(FilteredQuery.java:268) at java.util.AbstractList.hashCode(AbstractList.java:542) at org.apache.solr.search.QueryResultKey.&lt;init&gt;(QueryResultKey.java:49) at org.apache.solr.search.SolrIndexSearcher.getDocListC(SolrIndexSearcher.java:1084) at org.apache.solr.search.SolrIndexSearcher.search(SolrIndexSearcher.java:375) at org.apache.solr.handler.component.QueryComponent.process(QueryComponent.java:394) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:186) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:129) at org.apache.solr.core.SolrCore.execute(SolrCore.java:1376) at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:365) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:260) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:636) </code></pre> <p>The only thing I can see in the error message is that the plugin is invoked by solr.</p> <p>Any help would be appreciated, Thanks.</p>
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    1. COHave you downloaded the jar and included it into your solrconfig.xml as the linked-to page suggests? You say you're using a version provided by Drupal module developers, hence the question.
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    2. COYes, I edited solrconfig.xml and placed the jar in the right place. The plugin is correctly included I guess otherwise it won't appear in the backtrace and solr would complain about not knowing the bitwise operator. ... I edited my question to make this more clear, thanks.
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    3. CO@kekkis: Do you think the query syntax is correct or am I missing something - regarding to [DisMax Parameters](http://lucidworks.lucidimagination.com/display/solr/The+DisMax+Query+Parser)
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