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.sha...@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 <jpou...@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.sha...@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
