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https://issues.apache.org/jira/browse/ASTERIXDB-1972?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Taewoo Kim closed ASTERIXDB-1972.
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Resolution: Implemented
> Index-only plan
> ---------------
>
> Key: ASTERIXDB-1972
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-1972
> Project: Apache AsterixDB
> Issue Type: Improvement
> Reporter: Taewoo Kim
> Assignee: Taewoo Kim
> Priority: Major
>
> It would be nice to have an index-only plan feature where a secondary-index
> search alone can generate and return the final result without traversing the
> primary index and applying the final verification using SELECT operator. The
> reason that we need to traverse the primary index (+ verification using a
> SELECT operator) is that we don't do any locking during the secondary-index
> search. Therefore, the secondary-index search is not authoritative. In order
> to give such authority, the proposed solution is that apply an instantTryLock
> on each PK found during the secondary-index search. This guarantees that we
> see the final result. For more details, refer to the following google doc.
> https://docs.google.com/presentation/d/1Hj4ONmBWf5vf0EJrueygcoJirru2vy6eaCzmIiT0ypo/edit?usp=sharing
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