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David Rowley ae69c4fcf1 Fix use of incorrect TupleTableSlot in DISTINCT aggregates 
1349d2790 added code to allow DISTINCT and ORDER BY aggregates to work
more efficiently by using presorted input.  That commit added some code
that made use of the AggState's tmpcontext and adjusted the
ecxt_outertuple and ecxt_innertuple slots before checking if the current
row is distinct from the previously seen row.  That code forgot to set the
TupleTableSlots back to what they were originally, which could result in
errors such as:

ERROR:  attribute 1 of type record has wrong type

This only affects aggregate functions which have multiple arguments when
DISTINCT is used.  For example: string_agg(DISTINCT col, ', ')

Thanks to Tom Lane for identifying the breaking commit.

Bug: #18264
Reported-by: Vojtěch Beneš
Discussion: https://postgr.es/m/18264-e363593d7e9feb7d@postgresql.org
Backpatch-through: 16, where 1349d2790 was added
 		2024-01-04 20:38:25 +13:00
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doc Track conflict_reason in pg_replication_slots. 2024-01-04 08:26:25 +05:30
src Fix use of incorrect TupleTableSlot in DISTINCT aggregates 2024-01-04 20:38:25 +13:00
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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/.