{"name": "a",
 "type": "record",
 "comment": "Contains fields not in the table and none of the table fields",
 "fields": [
    {"name":"boolean2", "type": {"type": "boolean", "note": "alternate primitive syntax"}},
    {"name":"bytes", "type": "bytes",
     "note": "bytes is an invalid column type but can be read as a non-materialized field"}
]
}