The following bug has been logged on the website:
Bug reference: 16790
Logged by: Alexander Lakhin
Email address: exclusion(at)gmail(dot)com
PostgreSQL version: 13.1
Operating system: Ubuntu 20.04
Description:
It seems that the bitwise shift left operator ignores overflow:
SELECT -1::int4<<32;
-1
But:
SELECT (-1::int4<<31) * 2;
ERROR: integer out of range
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.)