Router transformation 2 groups 1. Input group 2. output
groups.
Output groups in 2 types. 1. user defined group 2. default group.
difference between expression and aggregator transformation?
Expression transformation calculate the single row values
before writes the target.Expression transformation executed by row-by-row basis
only.
Aggregator transformation allows you to perform aggregate
calculations like max, min,avg…
Aggregate transformation perform calculation on groups.
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