Exception handling the correct way

[Michal Seidl]

Hello,
is there any standard way how to catch Exceptions from Postgis functions?

For Example:
SELECT ST_Split(polygon_geom, polygon_geom)

result in general PostgreSQL InternalError exception with CODE XX000.

This is not very helpful to catch such specific error. It seem to me 
that also any other errors raise this general InternalError. The only 
way seems to read exception message, but is this the right way?

How to distinguish between different errors? I can not find anything in 
Postgis documentation https://postgis.net/docs/manual-3.4/

Thanks Michal S.