Github user hvanhovell commented on the pull request:
https://github.com/apache/spark/pull/11083#issuecomment-183999269
I have removed the closure from the `BroadcastDistribution`. We now depend
on `BroadcastMode`s to determine the kind of index to build. The actual index
creating function is added in `Exchange`, but we could also add this to
`BroadcastMode` the disadvantage being that we tie ourselves to one way of
index construction.
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