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sqrt(n)

Returns the square root of a number n. The value n can be any non-negative numeric value in the range of 0 <= n <= 1e308.
These examples are valid:
1q = foreach q generate sqrt(value) as value;
2q = filter q by sqrt(value) < 10;
These examples are invalid:
1q = group q by sqrt(value);
2q = order q by sqrt(value);