919f6d746e
Extended statistics commit 7b504eb282c did not include appropriate documentation next to where we document regular planner statistics (I ripped what was submitted before commit and then forgot to put it back), and while later commit 2686ee1b7ccf added some material, it structurally depended on what I had ripped out, so the end result wasn't proper. Fix those problems by shuffling what was added by 2686ee1b7ccf and including some additional material, so that now chapter 14 "Performance Tips" now describes the types of multivariate statistics we currently have, and chapter 68 "How the Planner Uses Statistics" shows some examples. The new text should be more in line with previous material, in (hopefully) the appropriate depth. While at it, fix a small bug in pg_statistic_ext docs: one column was listed in the wrong spot.
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. 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/.