Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/15677#discussion_r85995869 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala --- @@ -168,7 +200,12 @@ case class Nvl2(expr1: Expression, expr2: Expression, expr3: Expression) * Evaluates to `true` iff it's NaN. */ @ExpressionDescription( - usage = "_FUNC_(a) - Returns true if a is NaN and false otherwise.") + usage = "_FUNC_(expr) - Returns true if `expr` is NaN and false otherwise.", --- End diff -- `and false` -> `, or false`
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