DSXchange

In a job I am trying to find out the maximum and minimum date from the given date field. For that I was made a job with Aggregator stage.
I am getting the required out put, but I am getting multiple warring in the log file. The warring message I am listed below.

Acc005_Aggr_MaxMinDate_TopAcc..Aggr_MaxMin_Date: At row 1991, link "Input_Agg", while processing column "Output_Agg.MIN_FIRST_SHIP_DATE"
Value treated as NULL
Attempt to convert String value "" to Long type unsuccessful


Please let me know how to handle this warring.

Thanks and regards
Regi

Don't pass invalid data to the aggregator stage. Use a transformer's constraint. That's all.