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David Rowley 8b6b043cee Re-adjust drop-index-concurrently-1 isolation test 
It seems that drop-index-concurrently-1 has started to forget what it was
originally meant to be testing.  d2d8a229b, which added incremental sorts
changed the expected plan to be an Index Scan plan instead of a Seq Scan
plan.  This occurred as the primary key index of the table in question
provided presorted input and, because that index happened to be the
cheapest input path due to enable_seqscan being disabled, the incremental
sort changes just added a Sort on top of that.  It seems based on the name
of the PREPAREd statement that the intention here is that the query
produces a seqscan plan.

The reason this test has become broken seems to be due to how the test was
originally coded.  The test was trying to force a seqscan plan by
performing some casting to make it so the test_dc index couldn't be used
to perform the required filtering.  Trying to coax the planner into using
a plan which has costed in a disable_cost seems like it's always going to
be flakey as small changes in costs are drowned out by the large
disable_cost combined with add_path's STD_FUZZ_FACTOR.  Here we get rid of
the casts that we're using to try to trick the planner into a seqscan and
instead toggle enable_seqscan as and when required to get the desired
plan.

Additionally, rename a few things in the test and add some additional
wording to the comments to try and make it more clear in the future what
we expect this test to be doing.

Discussion: https://postgr.es/m/CAApHDvrbDhObhLV+=U_K_-t+2Av2av1aL9d+2j_3AO-XndaviA@mail.gmail.com
Backpatch-through: 13, where d2d8a229b changed the expected test output
2022-12-16 11:39:40 +13:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib basebackup_to_shell: Add some const qualifiers for consistency 2022-12-13 10:39:44 +01:00
doc Non-decimal integer literals 2022-12-14 06:17:07 +01:00
src Re-adjust drop-index-concurrently-1 isolation test 2022-12-16 11:39:40 +13:00
.cirrus.yml Add option to specify segment size in blocks 2022-12-07 19:32:59 -08:00
.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 Add b2e6e7682 to .git-blame-ignore-revs 2022-09-08 14:06:59 +07:00
.gitattributes Remove trailing whitespace from *.sgml files. 2022-04-20 11:04:49 -04:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Disable clang 16's -Wcast-function-type-strict. 2022-12-13 10:15:56 +13:00
configure.ac Disable clang 16's -Wcast-function-type-strict. 2022-12-13 10:15:56 +13:00
COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:31 -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
meson_options.txt Add option to specify segment size in blocks 2022-12-07 19:32:59 -08:00
meson.build Disable clang 16's -Wcast-function-type-strict. 2022-12-13 10:15:56 +13:00
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/.