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Robert Haas c596fadbfe Generate a separate upper relation for each stage of setop planning. 
Commit 3fc6e2d7f5 made setop planning
stages return paths rather than plans, but all such paths were loosely
associated with a single RelOptInfo, and only the final path was added
to the RelOptInfo.  Even at the time, it was foreseen that this should
be changed, because there is otherwise no good way for a single stage
of setop planning to return multiple paths.  With this patch, each
stage of set operation planning now creates a separate RelOptInfo;
these are distinguished by using appropriate relid sets.  Note that
this patch does nothing whatsoever about actually returning multiple
paths for the same set operation; it just makes it possible for a
future patch to do so.

Along the way, adjust things so that create_upper_paths_hook is called
for each of these new RelOptInfos rather than just once, since that
might be useful to extensions using that hook.  It might be a good
to provide an FDW API here as well, but I didn't try to do that for
now.

Patch by me, reviewed and tested by Ashutosh Bapat and Rajkumar
Raghuwanshi.

Discussion: http://postgr.es/m/CA+TgmoaLRAOqHmMZx=ESM3VDEPceg+-XXZsRXQ8GtFJO_zbMSw@mail.gmail.com
 		2018-03-19 11:55:38 -04:00
config Extend configure's __int128 test to check for a known gcc bug. 2018-01-18 11:09:44 -05:00
contrib Add 'unit' parameter to ExplainProperty{Integer,Float}. 2018-03-16 23:16:04 -07:00
doc Doc: note that statement-level view triggers require an INSTEAD OF trigger. 2018-03-18 15:10:28 -04:00
src Generate a separate upper relation for each stage of setop planning. 2018-03-19 11:55:38 -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 2018 2018-01-02 23:30:12 -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 Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
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 Tests for Kerberos/GSSAPI authentication 2018-03-06 10:57:36 -05:00
configure.in Tests for Kerberos/GSSAPI authentication 2018-03-06 10:57:36 -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:

	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/.