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https://issues.apache.org/jira/browse/SOLR-13806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16985349#comment-16985349
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Guna Sekhar Dora commented on SOLR-13806:
-----------------------------------------
[~ab] May I pick this up?
> SolrJ QueryResponse._explainMap is incorrectly typed
> ----------------------------------------------------
>
> Key: SOLR-13806
> URL: https://issues.apache.org/jira/browse/SOLR-13806
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 8.3
> Reporter: Andrzej Bialecki
> Priority: Major
> Labels: newdev
>
> This field, and the corresponding getter, and the code that extracts debug
> information from the NamedList response in {{extractDebugInfo}}, all use a
> {{Map<String, String>}} type.
> However, when {{debug.explain.structured=true}} is used the values returned
> in response are not String-s, instead they are {{SimpleOrderedMap}}-s. This
> causes the following exception to be thrown:
> {code}
> java.lang.ClassCastException: class
> org.apache.solr.common.util.SimpleOrderedMap cannot be cast to class
> java.lang.String (org.apache.solr.common.util.SimpleOrderedMap is in unnamed
> module of loader 'app'; java.lang.String is in module java.base of loader
> 'bootstrap')
> at
> __randomizedtesting.SeedInfo.seed([1D6FB4036A639051:173F5FF19E860E6F]:0)
> at
> org.apache.solr.client.solrj.response.QueryResponse.extractDebugInfo(QueryResponse.java:246)
> at
> org.apache.solr.client.solrj.response.QueryResponse.setResponse(QueryResponse.java:143)
> at
> org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:207)
> at org.apache.solr.client.solrj.SolrClient.query(SolrClient.java:987)
> ...
> {code}
> The simple fix is to change the type of this field to {{Map<String, Object>}}
> but this would change the public API of {{QueryResponse.getExplainMap()}} in
> incompatible way. Still, I would argue it's worth to change it - AFAIK this
> getter is not used anywhere in the Solr's codebase, and the change makes it
> more consistent with other getters.
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