Denormalized data before clear:

        0              500
        1              700
        2              900
        3             1100
        4             1300
Aggregation data after clear():

        0                0
        1                0
        2                0
        3                0
        4                0
Final (denormalized) aggregation data:

        0             1500
        1             2700
        2             2900
        3             3100
        4             3300

