Github user nickwallen commented on the issue:
https://github.com/apache/metron/pull/884
> @merrimanr: From what I can tell the problem is only in how the result is
displayed. For example, the expression 'BAR' in MAP([ 'foo', 'bar'], (x) ->
TO_UPPER(x) ) returns true as expected.
BUG! Good find. The value getting returned is always the first. I'll fix
that.
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