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https://issues.apache.org/jira/browse/SOLR-6780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230476#comment-14230476
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ASF subversion and git services commented on SOLR-6780:
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Commit 1642760 from hoss...@apache.org in branch 'dev/branches/branch_5x'
[ https://svn.apache.org/r1642760 ]
SOLR-6780: Fixed a bug in how default/appends/invariants params were affecting
the set of all keys found in the request parameters, resulting in some
key=value param pairs being duplicated. (merge r1642740)
> Merging request parameters with defaults produce duplicate entries
> ------------------------------------------------------------------
>
> Key: SOLR-6780
> URL: https://issues.apache.org/jira/browse/SOLR-6780
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.1, 5.0, Trunk
> Reporter: Alexandre Rafalovitch
> Assignee: Hoss Man
> Labels: parameters
> Fix For: 4.10.3, 5.0, Trunk
>
> Attachments: SOLR-6780.patch
>
>
> When a parameter (e.g. echoParams) is specified and overrides the default on
> the handler, it actually generates two entries for that key with the same
> value.
> Most of the time it is just a confusion and not an issue, however, some
> components will do the work twice. For example faceting component as
> described in http://search-lucene.com/m/QTPaSlFUQ1/duplicate
> It may also be connected to SOLR-6369
> The cause seems to be the interplay between
> *DefaultSolrParams#getParameterNamesIterator()* which just returns param
> names in sequence and *SolrParams#toNamedList()* which uses the first
> (override then default) value for each key, without deduplication.
> It's easily reproducible in trunk against schemaless example with
> bq. curl
> "http://localhost:8983/solr/schemaless/select?indent=true&echoParams=all";
> I've also spot checked it and it seems to be reproducible back to Solr 4.1.
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