Zhang Mingli <zmlpostgres@gmail.com> writes:
> Do we need to rollback error_context_stack to the previous state if we enter the branch for PG_CATCH()?
No. The PG_TRY mechanism itself deals with that: the next outer
level of PG_TRY will restore error_context_stack to what it had
been. If this were not so, most other places that add an
error_context_stack entry would also be broken.
regards, tom lane