Github user hvanhovell commented on a diff in the pull request:
https://github.com/apache/spark/pull/7057#discussion_r34603151
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/Window.scala ---
@@ -37,443 +59,622 @@ case class Window(
child: SparkPlan)
extends UnaryNode {
- override def output: Seq[Attribute] =
- (projectList ++ windowExpression).map(_.toAttribute)
+ override def output: Seq[Attribute] = projectList ++
windowExpression.map(_.toAttribute)
- override def requiredChildDistribution: Seq[Distribution] =
+ override def requiredChildDistribution: Seq[Distribution] = {
if (windowSpec.partitionSpec.isEmpty) {
- // This operator will be very expensive.
+ // Only show warning when the number of bytes is larger than 100 MB?
+ logWarning("No Partition Defined for Window operation! Moving all
data to a single "
+ + "partition, this can cause serious performance degradation.")
AllTuples :: Nil
- } else {
- ClusteredDistribution(windowSpec.partitionSpec) :: Nil
- }
-
- // Since window functions are adding columns to the input rows, the
child's outputPartitioning
- // is preserved.
- override def outputPartitioning: Partitioning = child.outputPartitioning
--- End diff --
Tiny follow-up. Now I know why I have removed it:
```org.apache.spark.sql.execution.UnaryNode```, the parent class of
```Window```, already implements this in exactly the same way:
```
private[sql] trait UnaryNode extends SparkPlan with
trees.UnaryNode[SparkPlan] {
self: Product =>
override def outputPartitioning: Partitioning = child.outputPartitioning
}
```
So do I still need to add this to the ```Window``` class?
---
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 [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
