Re: BUG #16790: Integer overflow not detected with << - Mailing list pgsql-bugs

PG Bug reporting form <noreply@postgresql.org> writes:
> It seems that the bitwise shift left operator ignores overflow:
> Is this an expected behavior (a kind of UB)? It's not like an arithmetic
> shift. (The semantic of '1::int4<<-1' is questionable too.)

It's defined to do whatever the C << operator does.  That will certainly
not involve throwing an error.

            regards, tom lane