Do you have more then one shard? Collapse requires that all docs in the same collapse group be co-located on the same shard.
Grouping I believe does not require this is some scenarios. Joel Bernstein http://joelsolr.blogspot.com/ On Thu, Feb 7, 2019 at 4:07 PM 刘正 <deathknight0...@gmail.com> wrote: > i try request this to techproducts collection > > {code} > > select?fl=id,genre_s&fq={!collapse%20field=genre_s}&indent=on&q=genre_s:*&wt=json > {code} > > and i get response > > {code:json} > { > "responseHeader":{ > "zkConnected":true, > "status":0, > "QTime":6, > "params":{ > "q":"genre_s:*", > "indent":"on", > "fl":"id,genre_s", > "fq":"{!collapse field=genre_s}", > "wt":"json"}}, > "response":{"numFound":3,"start":0,"maxScore":1.0,"docs":[ > { > "id":"0812521390", > "genre_s":"fantasy"}, > { > "id":"0553573403", > "genre_s":"fantasy"}, > { > "id":"0553293354", > "genre_s":"scifi"}] > }} > {code} > > when i request in grouping > > {code} > > select?fl=id,genre_s&group.field=genre_s&group.limit=1&group=true&indent=on&q=genre_s:*&wt=json > {code} > > i get the response > > {code:json} > { > "responseHeader":{ > "zkConnected":true, > "status":0, > "QTime":9, > "params":{ > "q":"genre_s:*", > "indent":"on", > "fl":"id,genre_s", > "group.limit":"1", > "wt":"json", > "group.field":"genre_s", > "group":"true"}}, > "grouped":{ > "genre_s":{ > "matches":10, > "groups":[{ > "groupValue":"fantasy", > "doclist":{"numFound":8,"start":0,"maxScore":1.0,"docs":[ > { > "id":"0553573403", > "genre_s":"fantasy"}] > }}, > { > "groupValue":"scifi", > "doclist":{"numFound":2,"start":0,"docs":[ > { > "id":"0553293354", > "genre_s":"scifi"}] > }}]}}} > {code} >
