PostgreSQL compatibility: ^ evaluates as bitwise XOR instead of exponentiation #22252

Split out from #22247.

Mismatch

^ evaluates as bitwise XOR instead of PostgreSQL exponentiation.

SELECT 2 ^ 3;

PostgreSQL:

8

DataFusion:

1

Expected behavior

For PostgreSQL-compatible SQL semantics, DataFusion should either match PostgreSQL's result or raise the same class of domain/semantic error.