\set upgrade_test_old_citus_version `echo "$CITUS_OLD_VERSION"`
SELECT substring(:'upgrade_test_old_citus_version', 'v(\d+)\.\d+\.\d+')::int > 11 OR
       (substring(:'upgrade_test_old_citus_version', 'v(\d+)\.\d+\.\d+')::int = 11 AND
        substring(:'upgrade_test_old_citus_version', 'v\d+\.(\d+)\.\d+')::int >= 2)
AS upgrade_test_old_citus_version_gte_11_2;
 upgrade_test_old_citus_version_gte_11_2
---------------------------------------------------------------------
 t
(1 row)

\gset
\if :upgrade_test_old_citus_version_gte_11_2
\q