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Select the field(s) in the input data (displayed as columns in the interface) that you want to group the data by. For example, if you select Day, a session will be created for each unique value for Day contained in the input data. You Each row of Fields is a Group by rule, and you can add multiple fields in a Group by rule, and then a each rule. A new session will be created for each unique combination.
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Examples Example- Group by rules Group by a single fieldGroup by is set to  The field ‘day’ is added to a Group by rule. This will group the input data based on values in the Day column and you get the day column. The following data records are received: Record 1: Day=Monday Record 2: Day=Wednesday Record 3: Day=Monday you will get two sessions, one for ‘Monday’ containing two records and one for ‘Wednesday’ containing one record.Result: Two sessions are created
Group by two fields  Group by is set to The fields ‘day’ and 'country' are added to a Group by rule. This will group the input data based on the values in the Day day column and the Country column and you get the country column. The following data records are received: Record 1: Day=Monday, Country=Sweden Record 2: Day=Wednesday, Country=France Record 3: Day=Monday, Country=France Record 4: Day=Monday, Country=Sweden Record 5: Day=Wednesday, Country=France Record 6: Day=Monday, Country= Sweden You will get three sessionsResult: Three sessions are created:
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Note!
You can also add multiple Group by rules. If you have multiple groups and the grouping cannot be performed based on the first rule, the next rule will be considered until a match is found. If a record does not match any of the Group by rule(s) rules, the stream will abort.
If you do not specify anything in Group by, aggregation will be performed based on all the columns.
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