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https://issues.apache.org/jira/browse/COUCHDB-997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12974762#action_12974762
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Paul Joseph Davis commented on COUCHDB-997:
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We could compare the length of the two lists. But that'd add an extra O(N) per
query_modify where N is sum of the lengths of the action lists.
> Prevent multiple keys from entering a btree.
> --------------------------------------------
>
> Key: COUCHDB-997
> URL: https://issues.apache.org/jira/browse/COUCHDB-997
> Project: CouchDB
> Issue Type: Bug
> Reporter: Paul Joseph Davis
>
> s/sort/usort/ at
> https://github.com/apache/couchdb/blob/trunk/src/couchdb/couch_btree.erl#L181
> This should be completely transparent and incur minimal overhead. This hasn't
> bitten us quite yet, but it would've prevented some of the crazier behavior
> from COUCHDB-968
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