Provided by: pgpool2_4.6.3-2_amd64 

NAME
SHOW_POOL_VERSION - displays a string containing the Pgpool-II release number.
SYNOPSIS
SHOW POOL_VERSION
DESCRIPTION
SHOW POOL_VERSION displays a string containing the Pgpool-II release number. Here is an example session:
test=# show pool_version;
pool_version
--------------------------
3.6.0 (subaruboshi)
(1 row)
pgpool-II 4.6.3 2023 SHOW POOL_VERSION(1)