can't read Hive NULLs to Decimal

[mschmill]

There does not seem to be a check for None in HiveDecimal.process_result_value().
If there is a NULL in a Hive column expected as Decimal, it causes TypeError: Cannot convert None to Decimal

Shouldn't this return NaN instead?

[jingw]

Good catch, this is as bug. It should probably return NULL/None though, as NaN is technically a non-null floating point value.

[devinstevenson]

@mschmill This is now fixed in master branch.