The filter caching features in Solr allow for precise control over how filter queries are handled in order to maximize performance. Solr has the ability to specify if a filter is cached, specify the order filters are evaluated, and specify post filtering. Solr Filter Queries Adding a filter expressed as […]
solr 4.0
Solr took another step toward increasing it’s NoSQL datastore capabilities, with the addition of realtime get. Background As readers probably know, Lucene/Solr search works off of point-in-time snapshots of the index. After changes have been made to the index, a commit (or a new Near Real Time softCommit) needs to […]
Solr’s Realtime Get
Lucene’s default ranking function uses factors such as tf, idf, and norm to help calculate relevancy scores. Solr has now exposed these factors as function queries. docfreq(field,term) returns the number of documents that contain the term in the field. termfreq(field,term) returns the number of times the term appears in the […]
Solr relevancy function queries
I previously introduced Solr’s Result Grouping, also called Field Collapsing, that limits the number of documents shown for each “group”, normally defined as the unique values in a field or function query. Since then, there have been a number of bug fixes, performance improvements, and feature enhancements. You’ll need a […]
Solr Result Grouping / Field Collapsing Improvements
Result Grouping, also called Field Collapsing, has been committed to Solr! This functionality limits the number of documents for each “group”, usually defined by the unique values in a field (just like field faceting). You can think of it like faceted search, except instead of just getting a count, you […]
Solr Result Grouping / Field Collapsing
Solr has been able to slurp in CSV for quite some time, and now I’ve finally got around to adding the ability to output query results in CSV also. The output format matches what the CSV loader can slurp. Adding a simple wt=csv to a query request will cause the […]