Range faceting

Range faceting can be done on date fields and numeric fields.

Range faceting parameters:

Parameter	Behavior	Default value
`facet.range`	Specifies the field for which Solr should create range facets. For example: `facet.range=salary&facet.range=rank` `facet.range=createdDate`
`facet.range.start`	Specifies from where (lower bound) the range starts. For example: `f.salary.facet.range.start=10000.0&f.rank.facet.range.start=1` `f.createdDate.facet.range.start=NOW/DAY-30DAYS`
`facet.range.end`	Specifies where (upper bound) the range ends. For example: `f.salary.facet.range.end=100000.0&f.rank.facet.range.end=50` `f.createdDate.facet.range.end=NOW/DAY+30DAYS`
`facet.range.gap`	The size of each range will be added to the `lower` bound successively until the `upper` bound is reached.
`facet.range.hardend`	A Boolean parameter that specifies how Solr should handle cases where `facet.range.gap` does not divide evenly between `lower` bound and `upper` bound. If it is `true`, the last range constraint will have the `facet.range.end` value as an `upper` bound. If `false`, the last range will have the smallest possible `upper` bound greater than `facet.range.end` such that the range is the exact width of the specified range gap.	`false`
`facet.range.include`	Determines how to compute range faceting between the lower bound and upper bound. Possible values are: `lower`: All gap-based ranges include their `lower` bound `upper`: All gap-based ranges include their `upper` bound `edge`: The first and last gap ranges include their `edge` bounds (`lower` for the first one, `upper` for the last one) even if the corresponding `upper`/`lower` option is not specified `outer`: The `before` and `after` ranges will be inclusive of their bounds even if the first or last ranges already include those boundaries `all`: Includes all options—`lower`, `upper`, `edge`, and `outer`.
`facet.range.other`	Specifies that, in addition to the counts for each range between `lower` bound and `upper` bound, counts should be computed for these options as well: `before`: All records with field values lower than `lower` bound of the first range `after`: All records with field values greater than the `upper` bound of the last range `between`: All records with field values between the start and end bounds of all ranges `none`: Do not compute any counts `all`: Compute counts for `before`, `between`, and `after`
`facet.range.method`	Specifies a faceting method: `filter`: Generates the ranges based on other `facet.range` parameters. `div`: Iterates all the documents that match the main query, and for each of them, it finds the correct range for the value. Not supporting for `DateRangeField` field type or when we have used `group.facets`.	`filter`

Example: Search query for iPod with faceting enabled and range for the field price from 1000 to 100000

URL: http://localhost:8983/solr/techproducts/select?defType=edismax&q=ipod&fl=id,name,price&facet=true&facet.range=price&facet.range.start=10&facet.range.end=20&facet.range.gap=5

Response:

{
 "responseHeader":{
 "status":0,
 "QTime":1,
 "params":{
 "facet.range":"price",
 "q":"ipod",
 "defType":"edismax",
 "facet.range.gap":"5",
 "fl":"id,name,price",
 "facet":"true",
 "facet.range.start":"10",
 "facet.range.end":"20"}},
 "response":{"numFound":3,"start":0,"docs":[
 {
 "id":"IW-02",
 "name":"iPod & iPod Mini USB 2.0 Cable",
 "price":11.5},
 {
 "id":"F8V7067-APL-KIT",
 "name":"Belkin Mobile Power Cord for iPod w/ Dock",
 "price":19.95},
 {
 "id":"MA147LL/A",
 "name":"Apple 60 GB iPod with Video Playback Black",
 "price":399.0}]
 },
 "facet_counts":{
 "facet_queries":{},
 "facet_fields":{},
 "facet_ranges":{
 "price":{
 "counts":[
 "10.0",1,
 "15.0",1],
 "gap":5.0,
 "start":10.0,
 "end":20.0}},
 "facet_intervals":{},
 "facet_heatmaps":{}}}

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Table of Contents for
Range faceting