type testObj struct {
	Index int    `json:"index"`
	Str   string `json:"str"`
}

// create new collection
col := column.NewCollection()

// add columns from struct
csvCols, err := StructToCols[testObj](col, "json")
if err != nil {
	return err
}

// add data
col.Query(func(txn *column.Txn) error {
  t := testObj{
    Index: 1,
    Str: "1",
  }
  // insert row based on struct
  txn.Insert(InsertStruct(&t, "json"))
  return nil
})

// save deep snapshot
if err := SaveDeepSnapshotFile(col, csvCols, "deep_snapshot.snappy"); err != nil {
	return err
}

---

// load deep snapshot
savedCol, savedCSVCols, err := LoadDeepSnapshotFile("deep_snapshot.snappy")
if err != nil {
	return err
}