I am trying to understand why faceting on a field with lots of unique values has a great impact on query performance. Since Googling for Solr facet algorithm did not yield anything, I looked how facets are implemented in Lucene. I found out that there are 2 methods - taxonomy-based and SortedSetDocValues-based. Does Solr facet capabilities are based on one of those methods? if so, I still cant understand why unique values impacts query performance...
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