Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/392
@ottobackwards Yep, the `TO_$TYPE` stellar functions should work with
inputs that are strings or numbers of other types. To wit,
* `TO_FLOAT('1231')` should yield a float (`1231.0f`) from the input string
* `TO_FLOAT('12.31')` should yield a float(`12.31f`) from the input string
* `TO_FLOAT(1231)` should yield a float (`1231.0f`) from the input int
* `TO_FLOAT(12.31)` should yield a float(`12.31f`) from the input double
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