In version 3.5, the way Join block joins results was updated to better handle cases where the input has a complex structure or includes attributes. Mashups created in versions prior to 3.5 will continue to join results in the same manner they always have, so this update does not disrupt your existing mashups.

This updated method also supports fine tuning the structure and mapping for the joined results. To use the fine tuning feature for Join blocks in existing mashups, you must delete the existing Join block(s) and recreate them.