Search is an integral part of peoples' online lives; people turn to search engines for help with a wide range of needs and desires, from satisfying idle curiousity to finding life-saving health remedies, from learning about medieval art history to finding video game solutions and pop music lyrics. Web search engines are now the second most frequently used online computer application, after email. Not long ago, most software applications did not contain a search module. Today, search is fully integrated into operating systems and is viewed as an essential part of most information systems.
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Yonik Seeley recently implemented a new method for faceting which will be available in Solr 1.4 (yet to be released). It is optimized for faceting on multi-valued fields with large number of unique terms but relatively low number of terms per document. The new method has made a large improvement in performance for faceted search and has cut memory usage at the same time.