Github user mattf-horton commented on the issue:
https://github.com/apache/metron/pull/681
Technically this is correct, as for example SQRT(-1) and SQRT(-2) clearly
should not show as equal, but by using NaN we (deliberately) lose the info that
would allow us to recognize that SQRT(-1)==SQRT(-1).
To detect/validate NaN, we would need an operator IS_NAN(x).
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