I don't know. The way I have saved the table was with autoloader as follows:

​I am saving a structure stream into a table using:

```

.writeStream

.format("delta") # <-----------

.option("checkpointLocation", checkpoint_path)

.option("path", output_path)

.trigger(availableNow=True)

.toTable(table_name, format='delta'))

```

Yet the produced table seems not to be a delta one as I cannot read it in Redash, nor the Data preview feature in databricks. Moreover if I run delta.DeltaTable.isDeltaTable(spark, TABLE_NAME) it returns False.