Configure the join condition to maintain the sort order established at the sort origin: the sorted flat file, the Source Qualifier transformation, or the Sorter transformation. If you use a sorted Aggregator transformation between the sort origin and the Joiner transformation, treat the sorted Aggregator transformation as the sort origin when you define the join condition. Use the following guidelines when you define join conditions:
The ports you use in the join condition must match the ports at the sort origin.
When you configure multiple join conditions, the ports in the first join condition must match the first ports at the sort origin.
When you configure multiple conditions, the order of the conditions must match the order of the ports at the sort origin, and you must not skip any ports.
The number of sorted ports in the sort origin can be greater than or equal to the number of ports at the join condition.