Major Description
Solr gives an empty list of facet values when faceting over a DateRangeField. I would expect Solr to return each unique combination of each range's from and to date as a facet value.
Here is an example response. Each document has a date range field "validrange_dr" ("*_dr" is mapped to a single-value DateRangeField), but faceting over this attribute gives an empty list of facet values. Doing this for normal date fields works as expected.
{
"responseHeader":{
"status":0,
"QTime":0,
"params":{
"q":"*:*",
"facet.field":"validrange_dr",
"indent":"true",
"fl":"validrange_dr",
"q.op":"OR",
"rows":"10",
"facet":"true",
"_":"1658503177774"}},
"response":{"numFound":38,"start":0,"numFoundExact":true,"docs":[
{
"validrange_dr":"[2021-06-22T12:18:23.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-06-30T09:49:13.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-07-06T10:48:10.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-07-17T15:36:41.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-08-04T08:23:13.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-06-15T01:05:50.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-07-05T13:33:17.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-05-26T19:33:26.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-06-12T21:29:45.000Z TO 2999-12-31T23:59:59.999Z]"},
{
"validrange_dr":"[2021-07-20T20:11:28.000Z TO 2999-12-31T23:59:59.999Z]"}]
},
"facet_counts":{
"facet_queries":{},
"facet_fields":{
"validrange_dr":[]},
"facet_ranges":{},
"facet_intervals":{},
"facet_heatmaps":{}}}