Re: Nested grouping/field collapsing

[Rih <ta...@gmail.com>]

Hey Martijn,

Did you find a good workaround?

Rih


On Sat, May 28, 2011 at 5:35 AM, Martijn Laarman <mp...@gmail.com> wrote:

> Thanks Mike,
>
> I've opened https://issues.apache.org/jira/browse/SOLR-2553 for this.
>
> It's exciting to hear a workable implementation might be possible!
>
> On Fri, May 27, 2011 at 6:23 PM, Michael McCandless <
> lucene@mikemccandless.com> wrote:
>
> > Can you open a Lucene issue (against the new grouping module) for
> > this?
> >
> > I think this is a compelling use case that we should try to support.
> >
> > In theory, with the "general" two-pass grouping collector, this should
> > be possible, but will require three passes, and we also must
> > generalize the 2nd pass collector to accept arbitrary collectors for
> > each group (today it's "hardwired" to sort-by-SortField collectors).
> >
> > I suspect coupling the single-pass grouping collector (currently still
> > a patch on LUCENE-3129) with the two-pass collector could also work.
> >
> > Also, can you describe more details about the two fields you want to
> > group/collapse by?
> >
> > Mike
> >
> > http://blog.mikemccandless.com
> >
> > On Fri, May 27, 2011 at 6:13 AM, Martijn Laarman <mp...@gmail.com>
> > wrote:
> > > Hi,
> > >
> > > I was wondering if this issue had already been raised.
> > >
> > > We currently have a use case where nested field collapsing would be
> > really
> > > helpful
> > >
> > > I.e Collapse on field X then Collapse on Field Y within the groups
> > returned
> > > by field X
> > >
> > > The current behavior of specifying multiple fields seem to be returning
> > > mutiple result sets.
> > >
> > > Has this already been feature requested ? Does anybody know of a
> > workaround
> > > ?
> > >
> > > Many thanks,
> > >
> > > Martijn
> > >
> >
>