postgres

Michael Paquier ecfed4a122 Improve error handling of column references in expression transformation Column references are not allowed in default expressions and partition bound expressions, and are restricted as such once the transformation of their expressions is done. However, trying to use more complex column references can lead to confusing error messages. For example, trying to use a two-field column reference name for default expressions and partition bounds leads to "missing FROM-clause entry for table", which makes no sense in their respective context. In order to make the errors generated more useful, this commit adds more verbose messages when transforming column references depending on the context. This has a little consequence though: for example an expression using an aggregate with a column reference as argument would cause an error to be generated for the column reference, while the aggregate was the problem reported before this commit because column references get transformed first. The confusion exists for default expressions for a long time, and the problem is new as of v12 for partition bounds. Still per the lack of complaints on the matter no backpatch is done. The patch has been written by Amit Langote and me, and Tom Lane has provided the improvement of the documentation for default expressions on the CREATE TABLE page. Author: Amit Langote, Michael Paquier Reviewed-by: Tom Lane Discussion: https://postgr.es/m/20190326020853.GM2558@paquier.xyz		6 years ago
config	Reorder configure tests for accept() in Windows	6 years ago
contrib	Switch some palloc/memset calls to palloc0	6 years ago
doc	Improve error handling of column references in expression transformation	6 years ago
src	Improve error handling of column references in expression transformation	6 years ago
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	7 years ago
.gitattributes	Remove contrib/tsearch2.	8 years ago
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	7 years ago
COPYRIGHT	Update copyright for 2019	7 years ago
GNUmakefile.in	Process EXTRA_INSTALL serially, during the first temp-install.	7 years ago
HISTORY	Change documentation references to PG website to use https: not http:	8 years ago
Makefile	Fix non-GNU makefiles for AIX make.	8 years ago
README	Change documentation references to PG website to use https: not http:	8 years ago
README.git	Change documentation references to PG website to use https: not http:	8 years ago
aclocal.m4	Fix configure's AC_CHECK_DECLS tests to work correctly with clang.	7 years ago
configure	Reorder configure tests for accept() in Windows	6 years ago
configure.in	Fix PERMIT_DECLARATION_AFTER_STATEMENT initialization.	6 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:

	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/.