Github user misutoth commented on a diff in the pull request: https://github.com/apache/spark/pull/20618#discussion_r168531352 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/mathExpressions.scala --- @@ -770,7 +837,14 @@ case class Unhex(child: Expression) extends UnaryExpression with ImplicitCastInp // scalastyle:off line.size.limit @ExpressionDescription( - usage = "_FUNC_(expr1, expr2) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates (`expr1`, `expr2`).", + usage = "_FUNC_(exprY, exprX) - Returns the angle in radians between the positive x-axis of a plane and the point given by the coordinates (`exprX`, `exprY`), " + + "as if computed by `java.lang.Math._FUNC_`.", + arguments = + """ + Arguments: + * exprY - the ordinate coordinate + * exprX - the abscissa coordinate --- End diff -- Sure, I will fix that. I borrowed that from java.lang.Math ... which sometimes is more complicated than it should be.
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