PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.
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Tom Lane
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I made multiple errors in commit 97532f7c, stemming mostly from failure to think about the available frequency data as being element frequencies not value frequencies (so that occurrences of different elements are not mutually exclusive). This led to sillinesses such as estimating that "word" would match more rows than "word:*". The choice to clamp to a minimum estimate of DEFAULT_TS_MATCH_SEL also seems pretty ill-considered in hindsight, as it would frequently result in an estimate much larger than the available data suggests. We do need some sort of clamp, since a pattern not matching any of the MCELEMs probably still needs a selectivity estimate of more than zero. I chose instead to clamp to at least what a non-MCELEM word would be estimated as, preserving the property that "word:*" doesn't get an estimate less than plain "word", whether or not the word appears in MCELEM. Per investigation of a gripe from Bill Martin, though I suspect that his example case actually isn't even reaching the erroneous code. Back-patch to 9.1 where this code was introduced.
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