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David Rowley b588cad688 Consider the "LIMIT 1" optimization with parallel DISTINCT 
Similar to what was done in 5543677ec for non-parallel DISTINCT, apply
the same optimization when the distinct_pathkeys are empty for the
partial paths too.

This can be faster than the non-parallel version when the first row
matching the WHERE clause of the query takes a while to find.  Parallel
workers could speed that process up considerably.

Author: Richard Guo
Reviewed-by: David Rowley
Discussion: https://postgr.es/m/CAMbWs49JC0qvfUbzs-TVzgMpSSBiMJ_6sN=BaA9iohBgYkr=LA@mail.gmail.com
 		2024-01-31 17:22:02 +13:00
config jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
contrib pgcrypto: Fix check for buffer size 2024-01-30 11:15:46 +01:00
doc Add a failover option to subscriptions. 2024-01-30 16:49:28 +05:30
src Consider the "LIMIT 1" optimization with parallel DISTINCT 2024-01-31 17:22:02 +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/.