I've fixed the documentation and added an ipow function that handles both
positive and negative ints, having 0^0 == 1 and 0^(negative) == PG_INT64_MAX
since that's what my glibc math.h pow() is returning.
From the comment:
* For exp < 0 return 0 except when the base is 1 or -1
I think that it should do what POW does in psql, i.e.:
fabien=# SELECT POW(2, -2); # 0.25
that is if exp < 0 the double version should be used, it should
not return 0.
Basically the idea is that the pgbench client-side version should behave
the same as the SQL version.
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