Fix pgpool-regclass(). It appeared that using PG_TRY/CATCH is not safe, sometimes backend dies with PANIC:  ERRORDATA_STACK_SIZE exceeded. The only solution is stealing some functions from PostgreSQL and modify it not to throw errors. This is not elegant at all but PostgreSQL developers do not allow to add such that built-in functions. Sigh.
Fix pgpool-regclass().
It appeared that using PG_TRY/CATCH is not safe, sometimes backend
dies with PANIC:  ERRORDATA_STACK_SIZE exceeded.
The only solution is stealing some functions from PostgreSQL
and modify it not to throw errors.
This is not elegant at all but PostgreSQL developers do not allow
to add such that built-in functions. Sigh.

treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres,treasure-data/prestogres