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https://issues.apache.org/jira/browse/SOLR-12959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16675672#comment-16675672
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Gus Heck commented on SOLR-12959:
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I've always wondered... are these two classes used merely for historical
reasons, perhaps because LinkedHashMap maybe wasn't appreciated/known at the
very start of things? Or is it that we replaced the collections classes to get
big performance gains from these custom structures and serializations?
I've always wondered why they didn't just implement Map, and why duplicate keys
would be allowed (apparently according to the javadocs)...
> Deprecate solrj SimpleOrderedMap
> --------------------------------
>
> Key: SOLR-12959
> URL: https://issues.apache.org/jira/browse/SOLR-12959
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrJ
> Reporter: Noble Paul
> Priority: Minor
>
> There is no difference between a NamedList and a SumpleOrderedMap. It
> doesn't help to have both of them when they are doing exactly free same things
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