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Tom Lane cf5ba7c30c Treat aggregate direct arguments as per-agg data not per-trans data. 
There is no reason to insist that direct arguments must match before
we can merge transition states of two aggregate calls.  They're only
used during the finalfn call, so we can treat them as like the finalfn
itself.  This allows, eg, merging of

select
  percentile_cont(0.25) within group (order by a),
  percentile_disc(0.5) within group (order by a)
from ...

This didn't matter (and could not have been tested) before we allowed
state merging of OSAs otherwise.

Discussion: https://postgr.es/m/CAB4ELO5RZhOamuT9Xsf72ozbenDLLXZKSk07FiSVsuJNZB861A@mail.gmail.com
 		2017-10-16 16:02:51 -04:00
config Extend & revamp pg_bswap.h infrastructure. 2017-09-29 17:24:39 -07:00
contrib Replace remaining uses of pq_sendint with pq_sendint{8,16,32}. 2017-10-11 21:00:46 -07:00
doc doc: Postgres -> PostgreSQL 2017-10-15 09:14:08 -04:00
src Treat aggregate direct arguments as per-agg data not per-trans data. 2017-10-16 16:02:51 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Add lcov --initial 2017-09-29 08:54:34 -04:00
COPYRIGHT Update copyright for 2017 2017-01-03 12:37:53 -05:00
GNUmakefile.in Have "make coverage" recurse into contrib as well 2016-09-05 18:44:36 -03:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Prevent passing down MAKELEVEL/MAKEFLAGS from non-GNU make to GNU make. 2017-08-09 12:05:53 -04:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
aclocal.m4 Make configure check for IPC::Run when --enable-tap-tests is specified. 2017-06-15 15:56:12 -04:00
configure Force "restrict" not to be used when compiling with xlc. 2017-10-13 12:15:06 -07:00
configure.in Force "restrict" not to be used when compiling with xlc. 2017-10-13 12:15:06 -07:00

README 

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:

	https://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
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.