ORA-22859: invalid modification of columns
Cause: An attempt was made to modify an object, REF, VARRAY, nested table, or LOB column type.
Action: Create a new column of the desired type and copy the current column data to the new type using the appropriate type constructor.
Cause: An attempt was made to modify an object, REF, VARRAY, nested table, or LOB column type.
Action: Create a new column of the desired type and copy the current column data to the new type using the appropriate type constructor.
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