Querying nested data is very difficult in any modern db that I have seen. If It works as you suggest then It would be cool if the feature was it going to be eventually maintained inside solr.
> On Jul 23, 2014, at 7:13 AM, Renaud Delbru <renaud@siren.solutions> wrote: > > One of the coolest features of Lucene/Solr is its ability to index nested > documents using a Blockjoin approach. > > While this works well for small documents and document collections, it > becomes unsustainable for larger ones: Blockjoin works by splitting the > original document in many documents, one per nested record. > > For example, a single USPTO patent (XML format converted to JSON) will end up > being over 1500 documents in the index. This has massive implications on > performance and scalability. > > Introducing SIREn > > SIREn is an open source plugin for Solr for indexing and searching rich > nested JSON data. > > SIREn uses a sophisticated "tree indexing" design which ensures that the > index is not artificially inflated. This ensures that querying on many types > of nested queries can be up to 3x faster. Further, depending on the data, > memory requirements for faceting can be up to 10x higher. As such, SIREn > allows you to use Solr for larger and more complex datasets, especially so > for sophisticated analytics. (You can read our whitepaper to find out more > [1]) > > SIREn is also truly schemaless - it even allows you to change the type of a > property between documents without being restricted by a defined mapping. > This can be very useful for data integration scenarios where data is > described in different ways in different sources. > > You only need a few minutes to download and try SIREn [2]. It comes with a > detailed manual [3] and you have access to the code on GitHub [4]. > > We look forward to hear about your feedbacks. > > [1] > http://siren.solutions/siren/resources/whitepapers/comparing-siren-1-2-and-lucenes-blockjoin-performance-a-uspto-patent-search-scenario/ > [2] http://siren.solutions/siren/downloads/ > [3] http://siren.solutions/manual/preface.html > [4] https://github.com/sindicetech/siren > -- > Renaud Delbru > CTO > SIREn Solutions
