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https://issues.apache.org/jira/browse/LUCENE-3759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13203118#comment-13203118
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Jason Rutherglen commented on LUCENE-3759:
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+1 Nice, distributed join will be super useful.
> Support joining a distributed environment.
> ------------------------------------------
>
> Key: LUCENE-3759
> URL: https://issues.apache.org/jira/browse/LUCENE-3759
> Project: Lucene - Java
> Issue Type: Improvement
> Components: modules/join
> Reporter: Martijn van Groningen
>
> Add two more methods in JoinUtil to support joining in a distributed manner.
> * Method to retrieve all from values.
> * Method to create a TermsQuery based on a set of from terms.
> With these two methods distributed joining can be supported following these
> steps:
> # Retrieve from values from each shard
> # Merge the retrieved from values.
> # Create a TermsQuery based on the merged from terms and send this query to
> all shards.
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