JoinMessage allows to perform a groupBy where all fields not in the GroupByList are available through an aggregation systematic. But the only supported aggregations are min, max, count, avg and sum.
Add two more:
first: simply the value of the first row in the group
concatenated: concatenation with ; as separator of the string representation of all values in the group
JoinMessage allows to perform a groupBy where all fields not in the GroupByList are available through an aggregation systematic. But the only supported aggregations are min, max, count, avg and sum. Add two more: