{
  "fields": [{"id":"_id","type":"int"},{"id":"col1","type":"numeric"},{"id":"col2","type":"numeric"},{"id":"col3","type":"numeric"}],
  "records": [
    [1,1,2,3],
    [2,1,2,3],
    [3,1,2,3],
    [5,1,2,3]
]}