Github user rxin commented on a diff in the pull request:
    --- Diff: 
    @@ -23,7 +23,13 @@ import org.apache.spark.sql.catalyst.util.TypeUtils
     import org.apache.spark.sql.types._
    -  usage = "_FUNC_(expr) - Returns the maximum value of expr.")
    +  usage =
    +    """
    +      _FUNC_(expr) - Returns the maximum value of expr."
    +        Arguments:
    +          expr - any type type expression.
    --- End diff --
    what does "type type" mean?

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