Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/10896#issuecomment-179386508
Okay, but that code doesn't actually produce an exchange right? Since its
captured by the cache?
```
== Optimized Logical Plan ==
Aggregate [col0#38918], [col0#38918,(sum(cast(col1#38919 as
bigint)),mode=Complete,isDistinct=false) AS
sum(col1)#38936L,(avg(cast(col2#38920 as
bigint)),mode=Complete,isDistinct=false) AS avg(col2)#38937]
+- InMemoryRelation [col0#38918,col1#38919,col2#38920], true, 10000,
StorageLevel(true, true, false, true, 1), Exchange
hashpartitioning(col0#38918,200), None, None
== Physical Plan ==
WholeStageCodegen
: +- TungstenAggregate(key=[col0#38918], functions=[(sum(cast(col1#38919
as bigint)),mode=Final,isDistinct=false),(avg(cast(col2#38920 as
bigint)),mode=Final,isDistinct=false)],
output=[col0#38918,sum(col1)#38936L,avg(col2)#38937])
: +- TungstenAggregate(key=[col0#38918],
functions=[(sum(cast(col1#38919 as
bigint)),mode=Partial,isDistinct=false),(avg(cast(col2#38920 as
bigint)),mode=Partial,isDistinct=false)],
output=[col0#38918,sum#38959L,sum#38960,count#38961L])
: +- INPUT
+- InMemoryColumnarTableScan [col0#38918,col1#38919,col2#38920],
InMemoryRelation [col0#38918,col1#38919,col2#38920], true, 10000,
StorageLevel(true, true, false, true, 1), Exchange
hashpartitioning(col0#38918,200), None, None
```
Eitherway, I'll let @yhuai sign off on this.
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