Solr has had full featured Field Collapsing and Grouping since 2010. The CollapsingQParserPlugin, which was recently committed, provides an alternative approach with more specific design goals. Design Goals The initial CollapsingQParserPlugin requirements were driven by a Solr ECommerce user. The … Continued
Sometimes a small programming change can have a big impact on functionality. This is the case with SOLR-5541, which allows the QueryElevationComponent to accept elevate and exclude Id’s as http parameters. Now you have complete control over the most important … Continued
In Solr 4.5, client side document routing was added to CloudSolrServer. This feature routes document updates to the correct shard leader. This is the default behavior for CloudSolrServer so you don’t have to do anything to turn it on. Just … Continued
Background I needed a really good hash function for the distributed indexing we’re implementing for Solr. Since it will be used for partitioning documents, it needed to be really high quality (well distributed) since we don’t want uneven shards. It … Continued
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 … Continued
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) … Continued
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 … Continued
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 … Continued
Solr 1.4 contains a new feature that allows range queries or range filters over arbitrary functions. It’s implemented as a standard Solr QParser plugin, and thus easily available for use any place that accepts the standard Solr Query Syntax by … Continued
