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Date: Tue, 13 Aug 2013 10:34:48 +0000 (UTC)
From: "Filippo Fadda (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
Message-ID: <JIRA.12663229.1376320973936.53716.1376390088455@arcas>
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Subject: [jira] [Commented] (COUCHDB-1868) Using multiple keys, the
 _all_docs built-in view acts differently then a user defined view
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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 ] 

Filippo Fadda commented on COUCHDB-1868:
----------------------------------------

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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