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Distinct count takes too long for big tables. #613

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@acautin

It seems most of the time is spent finding if the values are already present here:
https://github.com/K2InformaticsGmbH/dderl/blob/master/src/dderl_fsm.erl#L1559

Evaluate if the performance can be improved by using ets tables or maps for accumulating the intermediate results without having a big impact in the memory consumption/garbage generated.

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