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id jsonb_pretty
1 {
    "a": 1,
    "b": [
        "b1",
        "b2"
    ]
}
2 {
    "a": 2,
    "b": [
        "b3"
    ]
}
3 {
    "a": 3
}
INSERT 0 3
id attributes
1 {"a": 1, "b": ["b1","b2"]}
2 {"a": 2, "b": ["b3"]}
SELECT 2