@Tharun-Kumar thank you for your answer.

To understand better, you are saying to add a filter, meaning something like this?

.whenMatchedUpdate(set =
{
"id": "updates.id",
"firstName": "updates.firstName",
"middleName": "updates.middleName",
"lastName": "updates.lastName",
"gender": "updates.gender",
"birthDate": "updates.birthDate",
"ssn": "updates.ssn",
"salary": "updates.salary"
}
)

To put all the columns I am interested in and like this I will get exactly the real changes and I can do my merge in the Upper level, only with the real changes?