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

    https://github.com/apache/spark/pull/15487#discussion_r83470770
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Last.scala
 ---
    @@ -29,15 +29,18 @@ import org.apache.spark.sql.types._
      * a single partition, and we use a single reducer to do the aggregation.).
      */
     @ExpressionDescription(
    -  usage = "_FUNC_(expr,isIgnoreNull) - Returns the last value of `child` 
for a group of rows.")
    +  usage = """_FUNC_(expr,isIgnoreNull) - Returns the last value of `child` 
for a group of rows.
    +    _FUNC_(expr,isIgnoreNull=false) - Returns the last value of `child` 
for a group of rows.
    --- End diff --
    
    Why repeat this?


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