java - How can I get the size of Solr Facet results? -


there multi-value field in schema named xxx. , may more 10,0000 documents in solr, want how many values exist in xxx without duplication.

for now, use facet.field=xxx&facet.limit=-1 facet results size. spend lot of time , occur read timeout.

what want facet results 'size', don't care contents.

by way, use solr 5.0, there other better solution solve requirement?

the index maintain list of unique terms, since how inverted index works. very fast compute , return, unlike faceting. if values single terms, way of getting want. there way unique terms, given termscomponent enabled in solrconfig.xml. example:

http://localhost:8983/solr/corename/terms?q=*%3a*&wt=json&indent=true&terms=true&terms.fl=xxx

would return list of unique terms, , counts:

{   "responseheader":{   "status":0,   "qtime":0},   "terms":{     "xxx":[     "john backus",3,     "ada lovelace",3,     "charles babbage",2,     "john mauchly",1,     "alan turing",1     ]   } }

the length of list amount of unique terms, in example 5. unfortunately api doesn't provide way ask count, without returning list of terms, while has speed advantage in generating list, amount of time required return full list gives similar drawback facets approach. also, returned list may become quite long.

check out https://wiki.apache.org/solr/termscomponent api details.


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