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Tom Lane c5b7ba4e67 Postpone some stuff out of ExecInitModifyTable. 
Arrange to do some things on-demand, rather than immediately during
executor startup, because there's a fair chance of never having to do
them at all:

* Don't open result relations' indexes until needed.

* Don't initialize partition tuple routing, nor the child-to-root
tuple conversion map, until needed.

This wins in UPDATEs on partitioned tables when only some of the
partitions will actually receive updates; with larger partition
counts the savings is quite noticeable.  Also, we can remove some
sketchy heuristics in ExecInitModifyTable about whether to set up
tuple routing.

Also, remove execPartition.c's private hash table tracking which
partitions were already opened by the ModifyTable node.  Instead
use the hash added to ModifyTable itself by commit 86dc90056.

To allow lazy computation of the conversion maps, we now set
ri_RootResultRelInfo in all child ResultRelInfos.  We formerly set it
only in some, not terribly well-defined, cases.  This has user-visible
side effects in that now more error messages refer to the root
relation instead of some partition (and provide error data in the
root's column order, too).  It looks to me like this is a strict
improvement in consistency, so I don't have a problem with the
output changes visible in this commit.

Extracted from a larger patch, which seemed to me to be too messy
to push in one commit.

Amit Langote, reviewed at different times by Heikki Linnakangas and
myself

Discussion: https://postgr.es/m/CA+HiwqG7ZruBmmih3wPsBZ4s0H2EhywrnXEduckY5Hr3fWzPWA@mail.gmail.com
 		2021-04-06 15:57:11 -04:00
config Update copyright for 2021 2021-01-02 13:06:25 -05:00
contrib postgres_fdw: Allow partitions specified in LIMIT TO to be imported. 2021-04-07 02:32:10 +09:00
doc postgres_fdw: Allow partitions specified in LIMIT TO to be imported. 2021-04-07 02:32:10 +09:00
src Postpone some stuff out of ExecInitModifyTable. 2021-04-06 15:57:11 -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
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
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

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/.