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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:Delta-encode terms in interior nodes. While experiments have shown that this is of marginal utility when encoding terms resulting from regular English text, it turns out to be very useful when encoding inputs with very large terms. (CVS 3520)
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SHA1: c8151a998ec2423b417566823dc9957c7d5d782c
User & Date: shess 2006-11-29 01:02:03
Context
2006-11-29
05:17
http://www.sqlite.org/cvstrac/tktview?tn=2046

The virtual table interface allows for a cursor to field multiple xFilter() calls. For instance, if a join is done with a virtual table, there could be a call for each row which potentially matches. Unfortunately, fulltextFilter() assumes that it has a fresh cursor, and overwrites a prepared statement and a malloc'ed pointer, resulting in unfinalized statements and a memory leak.

This change hacks the code to manually clean up offending items in fulltextFilter(), emphasis on "hacks", since it's a fragile fix insofar as future additions to fulltext_cursor could continue to have the problem. (CVS 3521) check-in: 18142fdb user: shess tags: trunk

01:02
Delta-encode terms in interior nodes. While experiments have shown that this is of marginal utility when encoding terms resulting from regular English text, it turns out to be very useful when encoding inputs with very large terms. (CVS 3520) check-in: c8151a99 user: shess tags: trunk
2006-11-23
21:09
Improvements to the speed tests recently added to the test suite. (CVS 3519) check-in: 272c1a6e user: drh tags: trunk
Changes
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Changes to ext/fts2/fts2.c.