Take a look at the reduce() function. You'll have to write a custom reduce operation but you can follow the example here:
https://github.com/apache/lucene-solr/blob/master/solr/solrj/src/java/org/apache/solr/client/solrj/io/ops/GroupOperation.java You can plug in your custom reduce operation in the solrconfig.xml and use it like any other function. If you're interested in working on this you could create a ticket and I can provide guidance. Joel Bernstein http://joelsolr.blogspot.com/ 2018-06-14 13:13 GMT-04:00 Christian Spitzlay < christian.spitz...@biologis.com>: > Hi, > > is there a way to merge array values? > > Something that transforms > > { > "k1": "1", > "k2": ["a", "b"] > }, > { > "k1": "2", > "k2": ["c", "d"] > }, > { > "k1": "2", > "k2": ["e", "f"] > } > > into > > { > "k1": "1", > "k2": ["a", "b"] > }, > { > "k1": "2", > "k2": ["c", "d", "e", "f"] > } > > > And an inverse of cartesianProduct() that transforms > > { > "k1": "1", > "k2": "a" > }, > { > "k1": "2", > "k2": "b" > }, > { > "k1": "2", > "k2": "c" > } > > into > > { > "k1": "1", > "k2": ["a"] > }, > { > "k1": "2", > "k2": ["b", "c"] > } > > > Christian > > >
