key:int f0:string f1:int f2:int f3:double (all can be null)
no partition key
no bucket key
bucket count: 1
primary key: key
bitmap index: f0, f1, f2
file-index.in-manifest-threshold : 1B

Msgs:
snapshot-1, snapshot-2
Add: 0, Alice, 10, 1, 11.1
Add: 1, Bob, 10, 1, 12.1
Add: 2, Emily, 10, 0, 13.1
Add: 3, Tony, 10, 0, 14.1
Add: 4, Lucy, 20, 1, 15.1
Add: 5, Bob, 10, 1, 16.1
Add: 6, Tony, 20, 0, 17.1
Add: 7, Alice, 20, null, 18.1


Msgs:
snapshot-3, snapshot-4
Delete: 0, Alice, 10, 1, 11.1
Delete: 4, Lucy, 20, 1, 15.1
