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Mirror of the official PostgreSQL GIT repository. Note that this is just a *mirror* - we don't work with pull requests on github. To contribute, please see https://wiki.postgresql.org/wiki/Submitting_a_Patch
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David Rowley 3b1a7eb289 Don't zero tuple_fraction when planning UNIONs with ORDER BYs 
Since 66c0185a3, the planner is able to use Merge Append -> Unique to
implement UNION queries and each subquery is prompted to produce Paths
correctly sorted by the UNION's targetlist.

Here we remove some now redundant code which was zeroing the
tuple_fraction at the parent level.  This will allow the planner to
consider cheap startup paths when planning the UNION's subqueries.

EXCEPT and INTERSECT set operations still have the tuple_fraction zeroed
in generate_nonunion_paths().  These operations currently always read
all of their subqueries' tuples.

Reported-by: Tom Lane
Discussion: https://postgr.es/m/3703023.1711654574@sss.pgh.pa.us
2024-04-03 11:40:33 +13:00
config Remove AIX support 2024-02-28 15:17:23 +04:00
contrib Use streaming I/O in pg_prewarm. 2024-04-03 00:57:34 +13:00
doc Implement pg_wal_replay_wait() stored procedure 2024-04-02 22:48:03 +03:00
src Don't zero tuple_fraction when planning UNIONs with ORDER BYs 2024-04-03 11:40:33 +13:00
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README.md

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/.