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Andrew Gierth bf2d0462cd postgres_fdw: don't push ORDER BY with no vars (bug #15352) 
Commit aa09cd242 changed a condition in find_em_expr_for_rel from
being a bms_equal comparison of relids to bms_is_subset, in order to
support order by clauses on foreign joins. But this also allows
through the degenerate case of expressions with no Vars at all (and
hence empty relids), including integer constants which will be parsed
unexpectedly on the remote (viz. "ERROR: ORDER BY position 0 is not in
select list" as in the bug report).

Repair by adding an additional !bms_is_empty test.

Backpatch through to 9.6 where the aforementioned change was made.

Per bug #15352 from Maksym Boguk; analysis and patch by me.

Discussion: https://postgr.es/m/153518420278.1478.14875560810251994661@wrigleys.postgresql.org
2018-08-28 14:43:51 +01:00
config Remove test for VA_ARGS, implied by C99. 2018-08-24 10:41:45 -07:00
contrib postgres_fdw: don't push ORDER BY with no vars (bug #15352) 2018-08-28 14:43:51 +01:00
doc Rework option set of vacuumlo 2018-08-28 21:42:45 +09:00
src Avoid quadratic slowdown in regexp match/split functions. 2018-08-28 12:17:33 +01:00
.dir-locals.el Update documentation editor setup instructions 2018-07-13 21:23:41 +02:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Add configure infrastructure (--with-llvm) to enable LLVM support. 2018-03-20 17:26:25 -07:00
configure Remove test for VA_ARGS, implied by C99. 2018-08-24 10:41:45 -07:00
configure.in Remove test for VA_ARGS, implied by C99. 2018-08-24 10:41:45 -07:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Remove unwanted "garbage cleanup" logic in Makefiles. 2018-08-08 14:32:29 -04:00
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

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/.