Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18869#discussion_r132088990
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
 ---
    @@ -564,8 +611,27 @@ case class EqualNullSafe(left: Expression, right: 
Expression) extends BinaryComp
       }
     }
     
    +// scalastyle:off line.size.limit
     @ExpressionDescription(
    -  usage = "expr1 _FUNC_ expr2 - Returns true if `expr1` is less than 
`expr2`.")
    +  usage = "expr1 _FUNC_ expr2 - Returns true if `expr1` is less than 
`expr2`.",
    +  arguments = """
    +    Arguments:
    +      * expr1, expr2 - the two expressions must be same type or can be 
casted to a common type, and must be a type that can be ordered/compared.
    --- End diff --
    
    Thanks. Fixed.


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