Github user cestella commented on the issue:
https://github.com/apache/metron/pull/823
Slightly off topic (and not to dissuade from this good work which is much
clearer), but as a bit of stellar code golf, I did find out that you can do
this with `REDUCE`.
For Numerical types (note val is mixed numeric types):
```
[Stellar]>>> val := [1.2,2,3]
[Stellar]>>> REDUCE(val, (ret, x) -> ret > x ? x : ret, GET_FIRST(val))
1.2
[Stellar]>>> MIN(val)
1.2
[Stellar]>>> REDUCE(val, (ret, x) -> ret < x ? x : ret, GET_FIRST(val))
3
[Stellar]>>> MAX(val)
3
```
For non-numeric but comparable types:
```
[Stellar]>>> val := [ 'casey', 'stella' ]
[Stellar]>>> MAX(val)
stella
[Stellar]>>> REDUCE(val, (ret, x) -> ret < x ? x : ret, GET_FIRST(val))
stella
[Stellar]>>> MIN(val)
casey
[Stellar]>>> REDUCE(val, (ret, x) -> ret > x ? x : ret, GET_FIRST(val))
casey
```
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