sourceWrites table’s stream of updates to the empty sink.
Inside this routine, the data is formatted into the empty object, and then doesn’t
get written anywhere.
One (of a very few) examples, where you can probably need this kind of functionality
if the case when a Pathway program is benchmarked and the IO part needs to be
simplified as much as possible.
If the table is table, the null output can be configured in the following way: