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findAll() on Customer returns rows only. There is no orders field to be lazy or eager:
Customer[id=1, name=A, [email protected], tier=STANDARD]
1+N queries (4 SQL statements for 3 customers) -> [A:2, B:1, C:0]
two queries (2 SQL statements) -> [A:2, B:1, C:0]
one LEFT JOIN, grouped by hand (1 statement) -> [A:2, B:1, C:0]
all three strategies return identical aggregates: true