A field's value was updated even though I did not send data for that field

Panoply's ingestion process works on a row-level basis. That means that it will update the entire row and not one column at a time. In the case where you are sending data into Panoply using one of our data sources and a record with the same primary key already exists in the Panoply table, it will update every single field for that row. If, in the new incoming data, there is no value for that specific field or that field does not exist at all, it will be overwritten with null.