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Tom Lane 13d53aa7a8 Doc/improve confusing, inefficient tests to locate CTID variable. 
The IsCTIDVar() tests in nodeTidscan.c and nodeTidrangescan.c
look buggy at first sight: they aren't checking that the varno
matches the table to be scanned.  Actually they're safe because
any Var in a scan-level qual must be for the correct table ...
but if we're depending on that, it's pretty pointless to verify
varlevelsup.  (Besides which, varlevelsup is *always* zero at
execution, since we've flattened the rangetable long since.)

Remove the useless varlevelsup check, and instead add some
commentary explaining why we don't need to check varno.

Noted while fooling with a planner change that causes the order
of "t1.ctid = t2.ctid" to change in some tidscan.sql tests;
I was briefly fooled into thinking there was a live bug here.
 		2022-10-25 17:35:19 -04:00
config meson: Add initial version of meson based build system 2022-09-21 22:37:17 -07:00
contrib Fix assertion failures while processing NEW_CID record in logical decoding. 2022-10-20 08:49:48 +05:30
doc doc: Fix type of cursor_position in jsonlog table 2022-10-25 09:29:21 +09:00
src Doc/improve confusing, inefficient tests to locate CTID variable. 2022-10-25 17:35:19 -04:00
.cirrus.yml meson: Add support for building with precompiled headers 2022-10-06 17:19:30 -07:00
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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/.