I have created a custom Collector extending SimpleCollector. I can see the
methods scoreMode() and collect(int doc).
I am seeing that the collect method is invoked by lucene with the child
docId. Am I moving in the right direction?
But to collect the values I would need the Document by using
reader.document(int docID) and then parse it which would be again the same
issue i pointed out.
Thanks
Gopal Sharma
On Tue, Nov 16, 2021 at 1:41 PM Adrien Grand <jpountz@gmail.com> wrote:
> Indeed you shouldn't load all hits, you should register a
> org.apache.lucene.search.Collector that will aggregate data while matches
> are being collected.
>
> Since you are already using a ToChildBlockJoinQuery, you should be able to
> use it in conjunction with utility classes from lucene/facets. Have you
> looked into it already?
>
> On Tue, Nov 16, 2021 at 7:30 AM Gopal Sharma
> <gopal.sharma@algonomy.com.invalid> wrote:
>
> > Hi Adrien,
> >
> > Thanks for the reply.
> >
> > I am able to retrieve the child docId's using the .ToChildBlockJoinQuery.
> > Now for me to do aggregates i need to find the document using
> > reader.document(int docID) right?. If that is the case won't getting all
> > the documents would be a costly operation and then finally doing the
> > aggregates.
> >
> > Is there any other way around this?
> >
> > Thanks
> > Gopal Sharma
> >
> >
> >
> >
> >
> >
> >
> > On Mon, Nov 15, 2021 at 10:36 PM Adrien Grand <jpountz@gmail.com> wrote:
> >
> > > It's not straightforward as we don't provide high-level tooling to do
> > this.
> > > You need to use the BitSetProducer that you pass to the
> > > ToParentBlockJoinQuery in order to resolve the range of child doc IDs
> > for a
> > > given parent doc ID (see e.g. how ToChildBlockJoinQuery does it), and
> > then
> > > aggregate over these child doc IDs.
> > >
> > > On Mon, Nov 15, 2021 at 6:06 AM Gopal Sharma
> > > <gopal.sharma@algonomy.com.invalid> wrote:
> > >
> > > > Hi Team,
> > > >
> > > > I have a document structure as a customer which itself has few
> > attributes
> > > > like gender, location etc.
> > > >
> > > > Each customer will have a list of facts like transaction, product
> views
> > > > etc.
> > > >
> > > > I want to do an aggregation of the facts. For example find all
> > customers
> > > > who are from a specific location and have done transactions worth
> more
> > > than
> > > > 500$ between two date ranges.
> > > >
> > > > The queries can go deeper than this.
> > > >
> > > > Thanks in advance.
> > > >
> > > > Gopal Sharma
> > > >
> > >
> > >
> > > --
> > > Adrien
> > >
> >
>
>
> --
> Adrien
>