postgresql

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Tom Lane 5fc438fb25 Restore nodeAgg.c's ability to check for improperly-nested aggregates. While poking around in the aggregate logic, I noticed that commit `8ed3f11bb` broke the logic in nodeAgg.c that purports to detect nested aggregates, by moving initialization of regular aggregate argument expressions out of the code segment that checks for that. You could argue that this check is unnecessary, but it's not much code so I'm inclined to keep it as a backstop against parser and planner bugs. However, there's certainly zero value in checking only some of the subexpressions. We can make the check complete again, and as a bonus make it a good deal more bulletproof against future mistakes of the same ilk, by moving it out to the outermost level of ExecInitAgg. This means we need to check only once per Agg node not once per aggregate, which also seems like a good thing --- if the check does find something wrong, it's not urgent that we report it before the plan node initialization finishes. Since this requires remembering the original length of the aggs list, I deleted a long-obsolete stanza that changed numaggs from 0 to 1. That's so old it predates our decision that palloc(0) is a valid operation, in (digs...) 2004, see commit `24a1e20f1`. In passing improve a few comments. Back-patch to v10, just in case.		2017-10-15 19:19:18 -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	Restore nodeAgg.c's ability to check for improperly-nested aggregates.	2017-10-15 19:19:18 -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
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
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

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/.