We have two record set as an input:
1. key_1, key_2, prio, amount_1
2. key_2, amount_2
And look for this output
1. key_1, key_2, amount_3
under following rules:
- sort records by: prio, key_1, amount_2
- (prio is attribut of key_1 only, not relation of key_1, key_2)
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