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https://issues.apache.org/jira/browse/SOLR-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15376859#comment-15376859
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Joel Bernstein commented on SOLR-9103:
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I'm thinking we should externalize all the function mappings rather then having
them coded into classes. It just seems nicer to have a properties file to hold
the entire Streaming Expressions function table then to have them defined in
the solrconfig.xml. Also Streaming Expression can be run outside of Solr, so
having a properties file that can be pointed to would facilitate this.
> 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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