The term “dismax” gets tossed around on the Solr lists frequently, which can be fairly confusing to new users. Let’s see if we can demystify it a bit….

Read more

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 specifying the frange query type. Here’s an example of a filter specifying the lower and upper bounds for a function:

fq={!frange l=0 u=2.2}log(sum(user_ranking,editor_ranking))

The other interesting use for frange is to trade off memory …

Read more