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Robert Haas 4a4e6893aa Glue layer to connect the executor to the shm_mq mechanism. 
The shm_mq mechanism was built to send error (and notice) messages and
tuples between backends.  However, shm_mq itself only deals in raw
bytes.  Since commit 2bd9e412f9, we have
had infrastructure for one message to redirect protocol messages to a
queue and for another backend to parse them and do useful things with
them.  This commit introduces a somewhat analogous facility for tuples
by adding a new type of DestReceiver, DestTupleQueue, which writes
each tuple generated by a query into a shm_mq, and a new
TupleQueueFunnel facility which reads raw tuples out of the queue and
reconstructs the HeapTuple format expected by the executor.

The TupleQueueFunnel abstraction supports reading from multiple tuple
streams at the same time, but only in round-robin fashion.  Someone
could imaginably want other policies, but this should be good enough
to meet our short-term needs related to parallel query, and we can
always extend it later.

This also makes one minor addition to the shm_mq API that didn'
seem worth breaking out as a separate patch.

Extracted from Amit Kapila's parallel sequential scan patch.  This
code was originally written by me, and then it was revised by Amit,
and then it was revised some more by me.
2015-09-18 21:56:58 -04:00
config Remove support for Unix systems without the POSIX signal APIs. 2015-08-31 12:56:10 -04:00
contrib Fix error message wording in previous sslinfo commit 2015-09-08 11:10:20 -03:00
doc Order some new options on man pages more sensibly, minor improvements 2015-09-17 20:57:47 -04:00
src Glue layer to connect the executor to the shm_mq mechanism. 2015-09-18 21:56:58 -04:00
.dir-locals.el emacs: Set indent-tabs-mode in perl-mode 2015-04-12 23:53:23 -04:00
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Add .gitignore entries for AIX-specific intermediate build artifacts. 2015-07-08 20:44:22 -04:00
aclocal.m4 Replace our hacked version of ax_pthread.m4 with latest upstream version. 2015-07-08 20:36:06 +03:00
configure Remove support for Unix systems without the POSIX signal APIs. 2015-08-31 12:56:10 -04:00
configure.in Remove support for Unix systems without the POSIX signal APIs. 2015-08-31 12:56:10 -04:00
COPYRIGHT Update copyright for 2015 2015-01-06 11:43:47 -05:00
GNUmakefile.in Fix distclean/maintainer-clean targets to remove top-level tmp_install dir. 2015-05-13 18:48:05 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile Allow make check in PL directories 2011-02-15 06:52:12 +02:00
README Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00
README.git Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:04 -05:00

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:

	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/.