postgres

Robert Haas 131c7e70b4 postgres_fdw: Check PlaceHolderVars before pushing down a join. As discovered by Andreas Seltenreich via sqlsmith, it's possible for a remote join to need to generate a target list which contains a PlaceHolderVar which would need to be evaluated on the remote server. This happens when we try to push down a join tree which contains outer joins and the nullable side of the join contains a subquery which evauates some expression which can go to NULL above the level of the join. Since the deparsing logic can't build a remote query that involves subqueries, it fails while trying to produce an SQL query that can be sent to the remote side. Detect such cases and don't try to push down the join at all. It's actually fine to push down the join if the PlaceHolderVar needs to be evaluated at the current join level. This patch makes a small change to build_tlist_to_deparse so that this case will work. Amit Langote, Ashutosh Bapat, and me.		9 years ago
config	…
contrib	postgres_fdw: Check PlaceHolderVars before pushing down a join.	9 years ago
doc	PL/Python: Rename new keyword arguments of plpy.error() etc.	9 years ago
src	Fix multiple minor infelicities in aclchk.c error reports.	9 years ago
.dir-locals.el	…
.gitattributes	…
.gitignore	…
COPYRIGHT	…
GNUmakefile.in	…
HISTORY	…
Makefile	…
README	…
README.git	…
aclocal.m4	…
configure	Stamp 9.6beta1.	9 years ago
configure.in	Stamp 9.6beta1.	9 years ago

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/.