Github user tedyu commented on the pull request:
https://github.com/apache/spark/pull/6793#issuecomment-111751576
Looking at ArithmeticExpressionSuite.scala, it has some checks in the
following form:
checkDoubleEvaluation(c1 - c2, (-0.9 +- 0.001), row)
This seems to be better fit for checking the return value from Rand()
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