fefd9a3fed
Usually the compiler will optimize away the tail recursion anyway, but
if it doesn't, you can drive the function into stack overflow. For
example:
(n=1000000; printf "BEGIN;"; for ((i=1;i<=$n;i++)); do printf "SAVEPOINT s$i;"; done; printf "ERROR; COMMIT;") | psql >/dev/null
In order to get better readability and less changes to the existing code the
recursion-replacing loop is implemented as a wrapper function.
Report by Egor Chindyaskin and Alexander Lakhin.
Discussion: https://postgr.es/m/1672760457.940462079%40f306.i.mail.ru
Author: Alexander Korotkov, Heikki Linnakangas
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/.