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Grouping in SolrGrouping in Solr can be used to group results together based on fields. This is very similar to group-by clause in SQL with one important difference. SQL group-by clauses (OR Solr facets) only return the counts per group where as Solr Group option returns all the documents per group too. http://localhost:8983/solr/collection1/ select?q=*:*& wt=json& fl=id,cat,manu,price& indent=true& omitHeader=true& group=true& group.field=price& group.limit=2& rows=5
Note that the group options are very similar to the facet options like
{
"grouped":{
"price":{
"matches":1035,
"groups":[{
"groupValue":0.0,
"doclist":{"numFound":103,"start":0,"docs":[
{
"id":"GB18030TEST",
"price":0.0},
{
"id":"SOLR1000",
"manu":"Apache Software Foundation",
"cat":["software", "search"],
"price":0.0}]
}},
{
"groupValue":92.0,
"doclist":{"numFound":1,"start":0,"docs":[
{
"id":"SP2514N",
"manu":"Samsung Electronics Co. Ltd.",
"cat":["electronics", "hard drive"],
"price":92.0}]
}},
{
"groupValue":350.0,
"doclist":{"numFound":1,"start":0,"docs":[
{
"id":"6H500F0",
"manu":"Maxtor Corp.",
"cat":["electronics", "hard drive"],
"price":350.0}]
}},
{
"groupValue":19.95,
"doclist":{"numFound":1,"start":0,"docs":[
{
"id":"F8V7067-APL-KIT",
"manu":"Belkin",
"cat":["electronics", "connector"],
"price":19.95}]
}},
{
"groupValue":11.5,
"doclist":{"numFound":1,"start":0,"docs":[
{
"id":"IW-02",
"manu":"Belkin",
"cat":["electronics", "connector"],
"price":11.5}]
}
}
]
}
}
}
Using arbitrary queries for groupinghttp://localhost:8983/solr/collection1/ select?q=*:*& wt=json& fl=id,cat,manu,price& indent=true& omitHeader=true& group=true& group.query=price:[* TO 500]& group.query=price:[501 TO *]& group.limit=2& rows=5
{
"grouped":{
"price:[* TO 500]":{
"matches":1035,
"doclist":{
"numFound":1017,"start":0,
"docs":[
{
"id":"GB18030TEST",
"price":0.0},
{
"id":"SP2514N",
"manu":"Samsung Electronics Co. Ltd.",
"cat":["electronics", "hard drive"],
"price":92.0}
]
}},
"price:[501 TO *]":{
"matches":1035,
"doclist":{
"numFound":2,"start":0,
"docs":[
{
"id":"3007WFP",
"manu":"Dell, Inc.",
"cat":["electronics",
"monitor"],
"price":2199.0},
{
"id":"100-435805",
"manu":"ATI Technologies",
"cat":["electronics", "graphics card"],
"price":649.99}
]
}
}
}
}
The official Field Collapsing page provides a good description of all the options which can be used with facets. |
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