Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/45
@wangyum Thanks. Merged with some modifications.
```sql
select rescale(v,min,max) from (
select cast(1.2 as float) as v, 1.0 as min, 10.0 as max
union all
select cast(null as float) as v, 1.0 as min, 10.0 as max
union all
select cast(1.2 as double) as v, 1.0 as min, 10.0 as max
union all
select cast(null as double) as v, 1.0 as min, 10.0 as max
union all
select cast(1.2 as double) as v, cast(5.0 as double) as min, cast(10.0
as float) as max
) t;
0.022222228
NULL
0.022222228
NULL
-0.76
```
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