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

    https://github.com/apache/spark/pull/14788#discussion_r83336142
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ---
    @@ -916,21 +931,26 @@ case class ToDate(child: Expression) extends 
UnaryExpression with ImplicitCastIn
     }
     
     /**
    - * Returns date truncated to the unit specified by the format.
    + * Returns timestamp truncated to the unit specified by the format.
      */
     // scalastyle:off line.size.limit
     @ExpressionDescription(
    -  usage = "_FUNC_(date, fmt) - Returns returns date with the time portion 
of the day truncated to the unit specified by the format model fmt.",
    -  extended = "> SELECT _FUNC_('2009-02-12', 'MM')\n '2009-02-01'\n> SELECT 
_FUNC_('2015-10-27', 'YEAR');\n '2015-01-01'")
    +  usage = "_FUNC_(instant, fmt) - Returns returns date/timestamp with the 
time portion truncated to the unit specified by the format model fmt.",
    +  extended = "> SELECT _FUNC_('2009-02-12', 'MM')\n '2009-02-01 
00:00:00'\n> SELECT _FUNC_('2015-10-27', 'YEAR');\n '2015-01-01 00:00:00'")
     // scalastyle:on line.size.limit
    -case class TruncDate(date: Expression, format: Expression)
    +case class TruncInstant(instant: Expression, format: Expression)
    --- End diff --
    
    @hvanhovell ur.. actually, should I split other functions I corrected here? 
 `AddDays`, `DateSub` and  etc. also seem having the same problems. 


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