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Peter, What is a bitset? Is it a Java class or a more primitive data structure? Alan On 19-Jan-07, at 2:32 PM, Binkley, Peter wrote: > This is why I think we should figure out smart ways to manage facets > independently of Lucene index fields. Solr populates a facet by > setting > up a bitset for every value found in a given index field, and it uses > those bitsets to filter query result sets by deriving an intersection > set. We can extend that functionality by populating and maintaining > bitsets based on external data sources that can map to Lucene document > ids. This allows us to update the bitset (relatively cheap) without > having to update the index (relatively expensive).