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Tom Lane 04942bffd0 Remove rewriteTargetListIU's expansion of view targetlists in UPDATE. 
Commit 2ec993a7c, which added triggers on views, modified the rewriter
to add dummy entries like "SET x = x" for all columns that weren't
actually being updated by the user in any UPDATE directed at a view.
That was needed at the time to produce a complete "NEW" row to pass
to the trigger.  Later it was found to cause problems for ordinary
updatable views, so commit cab5dc5da restricted it to happen only for
trigger-updatable views.  But in the wake of commit 86dc90056, we
really don't need it at all.  nodeModifyTable.c populates the trigger
"OLD" row from the whole-row variable that is generated for the view,
and then it computes the "NEW" row using that old row and the UPDATE
targetlist.  So there is no need for the UPDATE tlist to have dummy
entries, any more than it needs them for regular tables or other
types of views.

(The comments for rewriteTargetListIU suggest that we must do this
for correct expansion of NEW references in rules, but I now think
that that was just lazy comment editing in 2ec993a7c.  If we didn't
need it for rules on views before there were triggers, we don't need
it after that.)

This essentially propagates 86dc90056's decision that we don't need
dummy column updates into the view case.  Aside from making the
different cases more uniform and hence possibly forestalling future
bugs, it ought to save a little bit of rewriter/planner effort.

Discussion: https://postgr.es/m/2181213.1619397634@sss.pgh.pa.us
2021-04-26 13:58:00 -04:00
config Update config.guess and config.sub 2021-04-21 16:33:40 +02:00
contrib amcheck: MAXALIGN() nbtree special area offset. 2021-04-23 15:37:03 -07:00
doc Doc: document EXTRACT(JULIAN ...), improve Julian Date explanation. 2021-04-26 11:50:35 -04:00
src Remove rewriteTargetListIU's expansion of view targetlists in UPDATE. 2021-04-26 13:58:00 -04:00
.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
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Remove configure-time probe for DocBook DTD. 2020-11-30 15:24:13 -05:00
configure Refactor HMAC implementations 2021-04-03 17:30:49 +09:00
configure.ac Refactor HMAC implementations 2021-04-03 17:30:49 +09:00
COPYRIGHT Update copyright for 2021 2021-01-02 13:06:25 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
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

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/.