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https://issues.apache.org/jira/browse/SOLR-7938?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dennis Gove closed SOLR-7938.
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Resolution: Implemented
> MergeStream to support N streams
> --------------------------------
>
> Key: SOLR-7938
> URL: https://issues.apache.org/jira/browse/SOLR-7938
> Project: Solr
> Issue Type: Improvement
> Components: SolrJ
> Affects Versions: Trunk
> Reporter: Dennis Gove
> Assignee: Dennis Gove
> Priority: Minor
> Labels: streaming
> Fix For: Trunk
>
> Attachments: SOLR-7938.patch
>
>
> Enhances MergeStream to support merging N streams. This was previously
> limited to merging just two streams but with this enhancement it can now
> accept any number of streams to merge.
> Based on the comparator, if more than one stream could provide the next value
> then the selected value will follow the order of the streams as they appear
> in the expression or were added to the MergeStream object.
> {code}
> merge(
> search(collection1, q="id:(0 4)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> search(collection1, q="id:(1)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> search(collection1, q="id:(2)", fl="id,a_s,a_i,a_f", sort="a_f asc, a_s
> asc"),
> on="a_f asc"
> )
> {code}
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