id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-020834-ch0fg9rp	Grand, Adrien	From MAXSCORE to Block-Max Wand: The Story of How Lucene Significantly Improved Query Evaluation Performance	2020-03-24		.txt	text/plain	2733	137	54	We share the story of how an innovation that originated from academia-blockmax indexes and the corresponding block-max Wand query evaluation algorithm of Ding and Suel [6] -made its way into the open-source Lucene search library. We see this paper as having two main contributions beyond providing a narrative of events: First, we report results of experiments that attempt to match the original conditions of Ding and Suel [6] and present additional results on a number of standard academic IR test collections. 3 Support for block-max indexes was the final feature that was implemented, based on the developers' reading of the paper by Ding and Suel [6] , which required invasive changes to Lucene's index format. The story of block-max Wand in Lucene provides a case study of how an innovation that originated in academia made its way into the world's most widely-used search library and achieved significant impact in the "real world" through hundreds of production deployments worldwide (if we consider the broader Lucene ecosystem, which includes systems such as Elasticsearch and Solr).	./cache/cord-020834-ch0fg9rp.txt	./txt/cord-020834-ch0fg9rp.txt