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https://issues.apache.org/jira/browse/COUCHDB-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15836491#comment-15836491
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Norbert Nemec commented on COUCHDB-2926:
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I thought so too, but then realized that this only works for $exists:true. On
$exists:false, an index cannot be used. Not sure what is the best way to handle
this situation...
> Move $exists into the view query instead of in-memory
> -----------------------------------------------------
>
> Key: COUCHDB-2926
> URL: https://issues.apache.org/jira/browse/COUCHDB-2926
> Project: CouchDB
> Issue Type: Improvement
> Components: Mango
> Reporter: Garren Smith
>
> $exists is in-memory - this is totally unnecessary. if you can do $gt: null
> on an indexed field, then you should be able to do $exists: true because it's
> exactly the same thing
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