message: also tested these situations before exporting
diff: @@ -14,6 +14,14 @@ CREATE TABLE tbl (
  statement ok
  INSERT INTO tbl VALUES(5);
  +# Generated columns can not be inserted into directly
  +statement error
  +INSERT INTO tbl VALUES(2,3)
  +
  +# 'x' can not be removed, as 'gen_x' depends on it
  +statement error
  +ALTER TABLE tbl DROP COLUMN x;
  +
  statement ok
  EXPORT DATABASE '__TEST_DIR__/export_generated_columns' (FORMAT CSV);
  