Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/46
@wangyum Are you agree with the following new behavior of
[rescale(value,min,max)](https://en.wikipedia.org/wiki/Feature_scaling#Rescaling)?
```
-- new
select rescale(4.2,1.0,3.0),rescale(-0.3, 1.0, 3.0);
> 1.0 0.0
-- old
select rescale(4.2,1.0,3.0),rescale(-0.3, 1.0, 3.0);
> 1.5999999 -0.65
```
Throwing an exception if value is out of range but exact min/max is
sometimes unknown beforehand.
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