DELTA_CANNOT_CHANGE_DATA_TYPE error condition
Cannot change the table schema.
ADD_NON_NULLABLE_COLUMN
Adding non-nullable column <columnName> is not supported.
CHANGE_DATA_TYPE
Changing the data type of column <columnName> from <fromType> to <toType> is not supported.
DROP_COLUMNS
Dropping column(s) <columnNames> is not supported.
TIGHTEN_NULLABILITY
Tightening the nullability of column <columnName> is not supported.