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https://issues.apache.org/jira/browse/HBASE-3342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack resolved HBASE-3342.
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Resolution: Later
Nice idea but no movement in years. Resolving as later.
> Server-side Row-level Inverted Index Join via Coprocessors
> ----------------------------------------------------------
>
> Key: HBASE-3342
> URL: https://issues.apache.org/jira/browse/HBASE-3342
> Project: HBase
> Issue Type: New Feature
> Components: Coprocessors
> Reporter: Jonathan Gray
>
> A common schema in HBase is to created an inverted index per row (a la inbox
> search) where a row is a user/entity, each column is a word, and versions are
> instances of that word in documents (values can be empty or could contain
> additional scoring info like position / count information).
> When querying indexes like this, we may want to do something like: give me
> the N most recent documents that contain the word "foo" (exact word matching)
> and contain a word that starts with "bar" (prefix matching).
> Currently this join has to be done on the client-side, so we may have to read
> far more than N documents for each word to be able to get N documents which
> match for both words. This gets worse as the number of words increase.
> We could implement this join on the server-side in a coprocessor.
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