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Tom Lane f37ac613a8 Prevent mis-encoding of "trailing junk after numeric literal" errors. 
Since commit 2549f0661, we reject an identifier immediately following
a numeric literal (without separating whitespace), because that risks
ambiguity with hex/octal/binary integers.  However, that patch used
token patterns like "{integer}{ident_start}", which is problematic
because {ident_start} matches only a single byte.  If the first
character after the integer is a multibyte character, this ends up
with flex reporting an error message that includes a partial multibyte
character.  That can cause assorted bad-encoding problems downstream,
both in the report to the client and in the postmaster log file.

To fix, use {identifier} not {ident_start} in the "junk" token
patterns, so that they will match complete multibyte characters.
This seems generally better user experience quite aside from the
encoding problem: for "123abc" the error message will now say that
the error appeared at or near "123abc" instead of "123a".

While at it, add some commentary about why these patterns exist
and how they work.

Report and patch by Karina Litskevich; review by Pavel Borisov.
Back-patch to v15 where the problem came in.

Discussion: https://postgr.es/m/CACiT8iZ_diop=0zJ7zuY3BXegJpkKK1Av-PU7xh0EDYHsa5+=g@mail.gmail.com
 		2024-09-05 12:42:33 -04:00
config Log LLVM library version in configure output. 2023-10-22 14:24:04 +13:00
contrib Restrict accesses to non-system views and foreign tables during pg_dump. 2024-08-05 06:05:25 -07:00
doc Clarify restrict_nonsystem_relation_kind description. 2024-08-30 15:06:02 -07:00
src Prevent mis-encoding of "trailing junk after numeric literal" errors. 2024-09-05 12:42:33 -04:00
.cirrus.star ci: Prepare to make compute resources for CI configurable 2023-08-23 15:15:29 -07:00
.cirrus.tasks.yml ci: Pin MacPorts version to 2.9.3. 2024-07-25 14:49:19 +12:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:29 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:40:57 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:01 -05:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:04 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:46 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Stamp 15.8. 2024-08-05 16:07:10 -04:00
configure.ac Stamp 15.8. 2024-08-05 16:07:10 -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/.