DBKV.reduce

You're seeing just the function reduce, go back to DBKV module for more information.
Link to this function

reduce(table, acc, reducer)

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Specs

reduce(t(), any(), (entry(), any() -> any())) :: any()

Calls Function on successive elements of table together with an extra argument acc. The table elements are traversed in unspecified order. reducer must return a new accumulator that is passed to the next call. acc is returned if the table is empty.