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https://issues.apache.org/jira/browse/COUCHDB-1868?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13738070#comment-13738070
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Filippo Fadda commented on COUCHDB-1868:
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OK, Robert might be right, we can only suppose how people used _all_docs, but
we can't know it for sure. Anyway, _all_docs can't be used to make joins, it
doesn't make any sense at all.
So, I'll leave unchanged _all_docs as is, and I will add a new query parameter,
for the user defined views, to return null rows.
> Using multiple keys, the _all_docs built-in view acts differently then a user
> defined view
> ------------------------------------------------------------------------------------------
>
> Key: COUCHDB-1868
> URL: https://issues.apache.org/jira/browse/COUCHDB-1868
> Project: CouchDB
> Issue Type: Bug
> Components: View Server Support
> Reporter: Filippo Fadda
>
> When you query a view using multiple keys, the _all_docs built-in view acts
> differently then a user defined view:
> 1) in the first case CouchDB returns "not_found" for every not found key;
> 2) querying a user defined view produces, instead, an empty array.
> In the first case you obtain error="not_found" for every key, when you query
> a user defined view you simply don't get any rows, just the total rows for
> the view.
> See: http://pastebin.com/D7NExJrd
> Now, regarding 'keys' the documentation says something like: "Used to
> retrieve just the view rows matching that set of keys. Rows are returned in
> the order of the specified keys."
> In a normal case, CouchDB should return just a row for each matched key, but
> it will really help, having an option to return a row for every key, even
> there if not found, because it's more easy, cycle through results.
> Let's suppose the application I'm doing gets the last 30 blog posts,
> displaying for each one, information that are stored into related documents.
> The application will query, using as keys the posts' identifiers, other views
> to get, for example, if a post has been starred from the current logged-in
> user, etc.
> If a view always returns a number of rows equals to the number of keys, the
> application can cycle from 0 to 29 and display all the related information
> for a post.
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