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From "Chris Anderson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (COUCHDB-707) Proposal for "Filter Views"
Date Tue, 30 Mar 2010 02:45:29 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12851223#action_12851223
] 

Chris Anderson commented on COUCHDB-707:
----------------------------------------

The forced deleting of remote documents for just some users isn't currently supported (and
isn't really compatible with offline data.)

I'd be be happy to support include_doc lookups for JSON list responses. It's a fair amount
of code, so I'd expect whoever will be using it to write it. 

If you do create this feature, I'm happy to commit it, but I want to note my architectural
reservations here.

> Proposal for "Filter Views"
> ---------------------------
>
>                 Key: COUCHDB-707
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-707
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: JavaScript View Server
>    Affects Versions: 0.11
>            Reporter: Luke Burton
>
> A common operation I find myself performing repeatedly is:
> * request a view (maybe with some basic filter like "keys" or a range of keys)
> * in my client, filter this view based on some complex criteria, leaving me with a small
set of document IDs (complex as in array intersections, compound boolean operations, &
other stuff not possible in the HTTP view API)
> * go back to Couch and fetch the complete documents for these IDs.
> List Views almost get me to the point of doing this purely in Couch. I can enumerate
over a view and do some complex things with it. But I can't output entire documents, unless
I use the include_docs=true flag which murders the performance of the list view.Apparently
because the entire view is fetched with including docs, THEN passed on to the list view JS.
Typically my complex filter criteria is contained in the view itself, so there is no need
to fetch the entire document until I know I have a match.
> In summary, a Filter View would execute some arbitrary JavaScript on each view row, with
access to HTTP request parameters, and return "true" for rows that match. The output would
be a list of IDs for whom the function returned true. include_docs=true would include the
matching documents.
> Performance would certainly not be as good as fetching a raw view, but it would indisputably
be better than fetching the entire view over HTTP to a client, deserializing the JSON, doing
some stuff, then making another HTTP request, and deserializing more JSON.
> I looked at the various entry points for list views in the Couch source. Unfortunately
it will take me some time to come up to speed with the source (if I ever have the time ...),
and I hope that what I'm asking for could be a simple extension to the List Views for someone
very familiar with this area.

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