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David Rowley 1fe66680c0 Attempt to stabilize flapping regression test 
Per buildfarm animal mylodon, the plan for this test was sometimes
swapping the join order for tenk1 and tenk2.  Given that add_path() has
no code that would cause this fluctuation when given paths with consistent
costs, this indicates that the costs must be fluctuating in some runs.
The only proven reason I've seen where that could happen was slight
variations in pg_class.relpages for some tables.  This was demonstrated to
be true by f03a9ca43 and related discussion.  Manually adjusting tenk2's
pg_class.relpages by subtracting just 1 page does cause the plan to change
for this test.

Here we've not gone to the same lengths to prove that's what's going on
in this case.  Proving that does not seem worth the time.  Let's just
shrink one side of the join so the additional cost of the swapped join
order is sufficiently different that if the relpages estimate is off a few
pages that the planner still shouldn't swap the join order.

Reported-by: Thomas Munro
Author: Andy Fan, David Rowley
Discussion: https://postgr.es/m/CA+hUKGLqC-NobKYfjxNM3Gexv9OJ-Fhvy9bugUcXsZjTqH7W=Q@mail.gmail.com
2024-02-16 15:01:29 +13:00
config jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
contrib Pull up ANY-SUBLINK with the necessary lateral support. 2024-02-15 12:06:12 +02:00
doc Introduce transaction_timeout 2024-02-15 23:56:12 +02:00
src Attempt to stabilize flapping regression test 2024-02-16 15:01:29 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Enable injection points in builds 2024-01-23 12:01:18 +09:00
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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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at:
https://www.postgresql.org/docs/devel/
In particular, information about building PostgreSQL from the source
code can be found at:
https://www.postgresql.org/docs/devel/installation.html

The latest version of this software, and related software, may be
obtained at https://www.postgresql.org/download/.  For more information
look at our web site located at https://www.postgresql.org/.