@JaeHwanChoi using Spark locally from my perspective does not make much sense. I have used it once to demonstrate how to load ORC files into a python node. I think you could also use such a Spark session within a python node for other things.
I have never tried to connect to such a local spark environment with knime nodes (in order to get the grey and black connectors). Not sure if that would be possible @sascha.wolke .
