Node at the end of a loop, collecting the intermediate results by joining the tables on their row IDs. In each iteration the node will join the current input table with the previous result. The join is based on the row ID on the incoming tables.
The typical use case of this node is that you calculate a set of new columns in the loop body and then feed only the newly created columns to this loop end node. It will join all intermediate results (the results from each iteration) using a join operation (full outer join on the RowID column). It is strongly recommended that you filter the original input data from the input as it will otherwise occur multiple times in the joined output. Use a Joiner node following this loop end node in order to join the result with the original input data (the data provided to the loop start node).