akpatnam25 commented on a change in pull request #33644:
URL: https://github.com/apache/spark/pull/33644#discussion_r690888342
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File path: core/src/main/scala/org/apache/spark/rdd/RDD.scala
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@@ -1233,6 +1233,22 @@ abstract class RDD[T: ClassTag](
(i, iter) => iter.map((i % curNumPartitions, _))
Review comment:
yes, we can add a new method with signature that looks like this:
```
def treeAggregate[U](
zeroValue: U,
seqOp: JFunction2[U, T, U],
combOp: JFunction2[U, U, U],
depth: Int,
finalAggregateOnExecutor: Boolean): U = {
...
```
you're right, we dont need to worry about Mima excludes then.
but that is not the problem. the problem is that this method will need to be
overloaded by the other treeAggregate methods. for example, the other
treeAggregate methods will have to call this version of treeAggregate. this is
an issue because of zeroValue:U is only inspected by the compiler to resolve
the overloaded methods. Due to that the compiler throws ambiguous reference to
overloaded definition, and this cannot be resolved..
there are only 2 workarounds:
1. create a new method with a different name but same signature with the new
parameter. something like `treeAggregateExecutor` and have somewhat duplicate
code in that method. me and @venkata91 thought this approach was kind of ugly
2. use config approach
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