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 recent nightly build of Solr 4.0-dev, or the newly released LucidWorks Enterprise v1.6, our commercial version of Solr.

Feature Enhancements

One improvement is the …

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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 get the top documents for that constraint or category. There are tons of potential use cases:

• For web search, only show 1 or

…

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