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

    https://github.com/apache/spark/pull/12105#discussion_r58715478
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/datetimeExpressions.scala
 ---
    @@ -391,13 +391,14 @@ abstract class UnixTime extends BinaryExpression with 
ExpectsInputTypes {
           case StringType if right.foldable =>
             val sdf = classOf[SimpleDateFormat].getName
             val fString = if (constFormat == null) null else 
constFormat.toString
    -        val formatter = ctx.freshName("formatter")
             if (fString == null) {
               s"""
                 boolean ${ev.isNull} = true;
                 ${ctx.javaType(dataType)} ${ev.value} = 
${ctx.defaultValue(dataType)};
               """
             } else {
    +          val formatter = ctx.freshName("sdf")
    --- End diff --
    
    Pardon my ignorance but is "sdf" the right name here? I admit I am not 
familiar with how the code gen works, but just looking at how it seems to 
operate, formatter seems to be a different reference than sdf.


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