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Full-Text Searching & the Burrows-Wheeler Transform

By Kendall Willets, December 01, 2003

Here's an indexing method that lets you find any character sequence in the source text using a structure that can fit the entire source text and index into less space than the text alone.
Dec03: Full-Text Searching & the Burrows-Wheeler Transform

Figure 2: This map is called FL because it rearranges the F column into the L column. FL is order-preserving for strings that start with the same character, so each character's section in FL contains an ascending list of integers. Here, you see the "fan-out" for blocks prefixed by "a."



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