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

    https://github.com/apache/spark/pull/9556#discussion_r44351639
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Count.scala
 ---
    @@ -32,23 +32,34 @@ case class Count(child: Expression) extends 
DeclarativeAggregate {
       // Expected input data type.
       override def inputTypes: Seq[AbstractDataType] = Seq(AnyDataType)
     
    -  private val count = AttributeReference("count", LongType)()
    +  private lazy val count = AttributeReference("count", LongType)()
     
    -  override val aggBufferAttributes = count :: Nil
    +  override lazy val aggBufferAttributes = count :: Nil
     
    -  override val initialValues = Seq(
    +  override lazy val initialValues = Seq(
         /* count = */ Literal(0L)
       )
     
    -  override val updateExpressions = Seq(
    +  override lazy val updateExpressions = Seq(
         /* count = */ If(IsNull(child), count, count + 1L)
       )
     
    -  override val mergeExpressions = Seq(
    +  override lazy val mergeExpressions = Seq(
         /* count = */ count.left + count.right
       )
     
    -  override val evaluateExpression = Cast(count, LongType)
    +  override lazy val evaluateExpression = Cast(count, LongType)
     
       override def defaultResult: Option[Literal] = Option(Literal(0L))
     }
    +
    +object Count {
    +  def apply(children: Seq[Expression]): Count = {
    --- End diff --
    
    Maybe document what is going on here.


---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---

---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org

Reply via email to