Hi Jack, On Sep 11, 2013, at 5:34pm, Jack Krupansky wrote:
> Do a copyField to another field, with a limit of 8 characters, and then use > that other field. Thanks - I should have included a few more details in my original question. The issue is that I've got an index with 200M records, of which about 50M have a unique value for this prefix (which is 32 characters long) So adding another indexed field would be significant, which is why I was hoping there was a way to do it via grouping/collapsing at query time. Or is that just not possible? Thanks, -- Ken > -----Original Message----- From: Ken Krugler > Sent: Wednesday, September 11, 2013 8:24 PM > To: solr-user@lucene.apache.org > Subject: Grouping by field substring? > > Hi all, > > Assuming I want to use the first N characters of a specific field for > grouping results, is such a thing possible out-of-the-box? > > If not, then what would the next best option be? E.g. a custom function query? > > Thanks, > > -- Ken > > -------------------------- > Ken Krugler > +1 530-210-6378 > http://www.scaleunlimited.com > custom big data solutions & training > Hadoop, Cascading, Cassandra & Solr > > > > > -------------------------- Ken Krugler +1 530-210-6378 http://www.scaleunlimited.com custom big data solutions & training Hadoop, Cascading, Cassandra & Solr
