Github user cestella commented on the issue:
https://github.com/apache/metron/pull/681
Yeah, it's true, I suppose having `==` double as a `NaN` check is probably
not the right thing due to the transitivity of equality (I'd like to `SQRT(-1)
== NaN` to be `true` but `SQRT(-1) == SQRT(-2)` to not be true). Probably it's
better to have an `IS_NAN(x)` like other languages.
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