Multiple Grouping Queries.

Grouping Query(group.query) should be a list for multiple queries, similar to group.field.

Example.
http://localhost:8983/solr/select?wt=json&indent=true&fl=name,price&q=memory&group=true&group.query=price:[0+TO+99.99]&group.query=price:[100+TO+*]&group.limit=3