Github user AnthonyTruchet commented on the issue:
https://github.com/apache/spark/pull/16038
It is related as if this PR get accepted, then the fix for PR to #16037
becomes trivial: replace treeAggregate with a call to
`treeAggregateWithZeroGenerator( () => (Vectors.zeros(n), 0.0))`, in which case
only the n gets caught in the closure if I'm not mistaken. This fix then gets
much easier to port to other similat use cases in MLlib.
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