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https://issues.apache.org/jira/browse/SOLR-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381084#comment-15381084
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David Smiley commented on SOLR-9103:
------------------------------------

We're just talking about mapping an invocation name to a class name, right?  If 
so, then how is this different than a QParserPlugin or a DocumentTransformer, 
or ValueSource?  Consistency in approach.

> Restore ability for users to add custom Streaming Expressions
> -------------------------------------------------------------
>
>                 Key: SOLR-9103
>                 URL: https://issues.apache.org/jira/browse/SOLR-9103
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Cao Manh Dat
>         Attachments: HelloStream.class, SOLR-9103.PATCH, SOLR-9103.PATCH
>
>
> StreamHandler is an implicit handler. So to make it extensible, we can 
> introduce the below syntax in solrconfig.xml. 
> {code}
> <expressible name="hello" class="org.apache.solr.search.HelloStream"/>
> {code}
> This will add hello function to streamFactory of StreamHandler.



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