Hello, looking at BroadcastHashJoinExec, it seems to me that it never destroys the broadcasted variables. And I think this can cause problems like SPARK-22575.
Anyway, when I tried to add a "cleanup" to destroy the variable, I saw some test failure because it was trying to access a the destroyed broadcasted variable. I think that the reason of this relies in BroadcastExchangeExec, where the same broadcasted relation can be provided if there are 2 or more invocations. Then my questions are: first of all, am I right or am I missing something? If I am right, in which cases a BroadcastExchangeExec can be used more than once (I can't think of any)? Thanks, Marco
