Lucene lecture at Pisa
Package: org.apache.lucene.analysis An Analyzer is a TokenStream factory. A TokenStream is an iterator over Tokens. input is a character iterator (Reader) A Token is tuple <text, type, start, length, positionIncrement> text (e.g., “pisa”). type (e.g., “word”, “sent”, “para”). start & length offsets, in characters (e.g, <5,4>) positionIncrement (normally 1) standard TokenStream implementations are
Fast Intersection of Sorted Lists Using SSE Instructions
Intersection of sorted lists is a cornerstone operation in many applications including search engines and databases because indexes are often implemented using different types of sorted structures. At GridDynamics, we recently worked on a custom database for realtime web analytics where fast intersection of very large lists of IDs was a must for good performance. From a functional point of view, w
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