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https://issues.apache.org/jira/browse/COUCHDB-529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Randall Leeds resolved COUCHDB-529.
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Resolution: Won't Fix
No activity in almost nine months.
Last comment suggests it's prohibitively expensive to implement this logic.
> Avoiding updating a doc's _rev if nothing changed
> -------------------------------------------------
>
> Key: COUCHDB-529
> URL: https://issues.apache.org/jira/browse/COUCHDB-529
> Project: CouchDB
> Issue Type: New Feature
> Components: Database Core
> Reporter: Matt Goodall
>
> Would it be possible for CouchDB to use its deterministic rev algorithm to
> avoid writing changes to the database if nothing has actually changed in the
> doc that is sent for update.
> The most obvious use case is the user who clicks an HTML form's submit
> button, instead of using the back button, when they haven't changed anything.
> I suspect most applications do not check if the user made any changes and
> therefore end up sending exactly the same data back as an update ...
> unnecessarily creating a new document rev, growing the database, invalidating
> views, triggering _changes updates, etc.
> If CouchDB could determine that the new document is the same as the old
> document then it could avoid writing to disc and return the current _rev in
> the response.
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