Thanks for the hint and please excuse my not thouroughly enough
reading of the documentation. I did not suspect such Feature amongst
controll structures.
Zitat von Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>:
> https://www.postgresql.org/docs/current/static/plpgsql-control-structures.html#PLPGSQL-CALL-STACK
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