given: very_large | filter_1 | filter_2 | filter_3 | filter_4

if the cursor is in the filter_2, only run: very_large | filter_1 | filter_2

why? when writing a series of filter it happens that after writing filter_4 the results contain data that one thought would be filtered/transformed by filter_1. It is of course possible possible to add another filter but maybe not logical. when changing filter_1, a view of the output would be very helpful but that's not possible without deleting the pipeline.