Speed up query list generation for dense matching #453
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Python does not seem to be a fan of summing tuples > Python 3.9 was stuck on this line for several minutes on a large dataset before I killed it.
Probably related to https://stackoverflow.com/questions/41032630/why-is-pythons-built-in-sum-function-slow-when-used-to-flatten-a-list-of-lists
Switching to set(chain.from_iterable) made it ~instant.