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From Martin Hewitt <>
Subject Re: Full text search - is it coming? If yes, approx when.
Date Mon, 28 Mar 2011 15:16:50 GMT
Bit off-topic Robert, but CouchDB-lucene really is superb, we use it extensively and it's just
brilliant, so thanks for contributing it to the Couch community.


On 28 Mar 2011, at 15:30, Robert Newson wrote:

> I am a CouchDB committer and author of couchdb-lucene. :)
> B.
> On 28 March 2011 10:44, Andrew Stuart (SuperCoders)
> <> wrote:
>> Hi Robert
>> "there are no publicly known plans to build a native full-text indexing
>> feature for CouchDB."
>> I don't know who is who around here as yet - are you commenting from inside
>> knowledge or as an end user/developer?
>> Thanks
>> On 28/03/2011, at 8:24 PM, Robert Newson wrote:
>> I have to dispute "There does not seem to be much understanding that
>> this could be a killer feature."
>> Obviously full-text search is a killer feature, but it's trivially
>> available now via couchdb-lucene or elasticsearch.
>> What people are asking for is native full-text search which, to me, is
>> essentially asking for an Erlang port of Lucene. We'd love this, but
>> it's a huge amount of work. Continually asking others to do
>> significant amounts of work is also wearying.
>> To replace a Lucene-based solution and match its quality and breadth
>> is a huge chunk of work and is only necessary to satisfy people who,
>> for various reasons, don't want to use Java.
>> To answer the original post, there are no publicly known plans to
>> build a native full-text indexing feature for CouchDB.
>> B.
>> On 28 March 2011 10:15, Olafur Arason <> wrote:
>>> There does not seem to be much understanding that this could be a killer
>>> feature. People are now relying on Lucene which monitors the _changes
>>> feed.
>>> Cloudant has done it's own implementation which I gather through the
>>> information they have published makes a view out of all your word,
>>> they recommend java view because you can then reuse the lexer from
>>> Lucene. Then I think they are reusing the reader of the view to make
>>> their query. They have a similar syntax as Lucene for the query interface.
>>> They are still working on this and I think they don't have that much
>>> incentive to opensource it right away. But they have in past both
>>> opensourced there technology like BigCouch so I think it's more a
>>> matter of when rather then if.
>>> I think this is a good solution for a fulltext search. But I don't think
>>> that
>>> the java view does not have direct access to the data so it could be
>>> slow. But cloudant does clustering on view generation so that helps.
>>> But there is also general problem with the current view system where
>>> search technology could be used.
>>> The view are really good at sorting but people are using them to
>>> do key matches which they are not designed for. They beginkey and
>>> endkey are for sorting ranges and are not good for matching which
>>> most resources online are pointing to.
>>> For example when you do:
>>> beginkey = ["key11", "key21"]
>>> endkey = ["key19", "key21"]
>>> You get ["key11","key22"], ["key11", "key23"] ... ["key12","key21"],
>>> ["key12","key22"]...
>>> which makes sense when looking up sorting ranges but not using it to
>>> match keys. But you can have a range match lookup but only on the
>>> last key and never on two keys. So this would work:
>>> beginkey = ["key21", "key11"]
>>> endkey = ["key21", "key19"]
>>> The current view interface could be augmented to accept queries
>>> and could make them much more powerful then they currently are
>>> and just using the keys for sorting and selecting which values you
>>> want shown which they are designed to do and do really well.
>>> This would be a killer feature and could use the new infrastructure
>>> from Cloudant search.
>>> And don't tell me the Elastic or Lucene interface could do anything
>>> close to this :)
>>> Regards,
>>> Olafur Arason
>>> On Mon, Mar 28, 2011 at 04:31, Andrew Stuart (SuperCoders)
>>> <> wrote:
>>>> It would be good to know if full text search is coming as a core feature
>>>> and
>>>> if yes, approximately when - does anyone know?
>>>> Even an approximate timeframe would be good.
>>>> thanks
>> --
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