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Hashjoin draft #4
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Note that this is not done yet.
The main two things that need to be implemented are:
RecordBatch)For now, I'm just going to take the join keys and hash those and use those as the inner hashmap keys, this is the simpler solution for now.
The helper data structures are also probably abstracted enough so that we can easily replace them with better versions in the futures (better as in more performant + we can add a buffer pool onto them)