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In the refactoring in commit d37b816dc9e8f976c8913296781e08cbd45c5af1, we mostly kept to the original design whereby only the last few words on the line were matched to identify a completable pattern. However, after commit d854118c8df8c413d069f7e88bb01b9e18e4c8ed, there's really no reason to do it like that: where it's sensible, we can use patterns that expect to match the entire input line. And mostly, it's sensible. Matching the entire line greatly reduces the odds of a false match that leads to offering irrelevant completions. Moreover (though I've not tried to measure this), it should make tab completion faster since many of the patterns will be discarded after a single integer comparison that finds that the wrong number of words appear on the line. There are certain identifiable places where we still need to use TailMatches because the statement in question is allowed to appear embedded in a larger statement. These are just a small minority of the existing patterns, though, so the benefit of switching where possible is large. It's possible that this patch has removed some within-line matching behaviors that are in fact desirable, but we can put those back when we get complaints. Most of the removed behaviors are certainly silly. Michael Paquier, with some further adjustments by me
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/.