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https://issues.apache.org/jira/browse/SOLR-4970?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jilani Shaik updated SOLR-4970:
-------------------------------

    Attachment: collectioncomm.zip

Contains the files related to collection communication and response writer to 
merge the results.
                
> Collection communication for merging the facet query result from one 
> collection to other collection
> ---------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-4970
>                 URL: https://issues.apache.org/jira/browse/SOLR-4970
>             Project: Solr
>          Issue Type: New Feature
>          Components: SearchComponents - other
>            Reporter: Jilani Shaik
>            Priority: Minor
>              Labels: features
>         Attachments: collectioncomm.zip
>
>
> Scenario: 
> We will have two categories of data, where one category will be the list of 
> primary data (for example products) and the other collection (it could be 
> spread across shards) holds the transaction data (for example product sales 
> data). We have a search scenario where we need to show the products along 
> with the number of sales for each product. 
> We can do flatten the schema with all data together, But if the primary 
> data(it could be very less may be <10000) should be in one collection where 
> as the transaction data(it could be in millions) in multiple shards, then we 
> wish to have this feature where the request handler will search the data from 
> one collection and the corresponding search results docs should pass to the 
> next query for faceting and then before writing the response merge these 
> together to appear the result as coming from one collection. 

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