You are doing things correctly. I was incorrect about the behavior of the group() operation.
I think the behavior you are looking for should be done using reduce() but we'll need to create a reduce operation that does this. If you want to create a ticket we can work through exactly how the operation would work. Joel Bernstein http://joelsolr.blogspot.com/ On Fri, Jun 15, 2018 at 8:04 AM, Christian Spitzlay < christian.spitz...@biologis.com> wrote: > Hi, > > I had come across the reduce function in the docs but > I have a hard time getting it to work; I haven't found any documentation > on it > or its parameters, and the source code of the GroupOperation doesn't > explain it either ... > For example, what is the "n" parameter about? > > > I constructed a source stream to produce the input from my second example: > > merge( > sort(cartesianProduct(tuple(k1="1", k2=array(a)), k2, productSort="k1 > asc"), by="k1 asc"), > sort(cartesianProduct(tuple(k1="2", k2=array(b,c)), k2, > productSort="k1 asc"), by="k1 asc"), > on="k1 asc" > ) > > ---> > > { > "result-set": { > "docs": [ > { > "k1": "1", > "k2": "a" > }, > { > "k1": "2", > "k2": "b" > }, > { > "k1": "2", > "k2": "c" > }, > { > "EOF": true, > "RESPONSE_TIME": 0 > } > ] > } > } > > > > Then wrapped in a reduce function: > > > reduce( > merge( > sort(cartesianProduct(tuple(k1="1", k2=array(a)), k2, productSort="k1 > asc"), by="k1 asc"), > sort(cartesianProduct(tuple(k1="2", k2=array(b,c)), k2, > productSort="k1 asc"), by="k1 asc"), > on="k1 asc" > ), > by="k1", > group(sort="k1 asc", n="10") > ) > > ---> > > { > "result-set": { > "docs": [ > { > "k1": "1", > "k2": "a", > "group": [ > { > "k1": "1", > "k2": "a" > } > ] > }, > { > "k1": "2", > "k2": "c", > "group": [ > { > "k1": "2", > "k2": "c" > }, > { > "k1": "2", > "k2": "b" > } > ] > }, > { > "EOF": true, > "RESPONSE_TIME": 0 > } > ] > } > } > > > It adds a field "group" that contains an array of the unchanged input > documents with the same "by" value, > not grouped values. > > { > "result-set": { > "docs": [ > { > "k1": "1", > "k2": "a", > "group": [ > { > "k1": "1", > "k2": "a" > } > ] > }, > { > "k1": "2", > "k2": "c", > "group": [ > { > "k1": "2", > "k2": "c" > }, > { > "k1": "2", > "k2": "b" > } > ] > }, > { > "EOF": true, > "RESPONSE_TIME": 0 > } > ] > } > } > > > Or am I doing it wrong? > > Christian Spitzlay > > > > > > > > > > > > Am 15.06.2018 um 01:48 schrieb Joel Bernstein <joels...@gmail.com>: > > > > Actually you're second example is probably a straight forward: > > > > reduce(select(...), group(...), by="k1") > > > > Joel Bernstein > > http://joelsolr.blogspot.com/ > > > > On Thu, Jun 14, 2018 at 7:33 PM, Joel Bernstein <joels...@gmail.com> > wrote: > > > >> 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 > >>> > >>> > >>> > >> > >
