Avoid multiple borrows in join #311
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This was referenced Mar 15, 2021
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The recent join rework left us in a situation where we might attempt to borrow
trace1andtrace2at the same time, which fails if they are the same trace (i.e. a self-join). Not a big deal, and we just stage the capture of information from the two traces one after the other.cc: @philip-stoev