How Final Aggregation Happens with partitions?

ksqlDB
1

Example i have topic with 4 partition and 2 instance ksqdb. As I understood from the documentation, each instance will take on two partitions.
Next i run query that SUM ALL TICKET VALUES, every instance calculate for self partitions but but where will the final aggregation(sum) of the last two values occur?

SELECT 
           SUM(TICKET_TOTAL_VALUE) AS TOTAL_VALUE
    FROM MOVIE_TICKET_SALES

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