code: public function deleteColumn()
      {
          $schemaManager = $this->connection->getSchemaManager();
          $columns       = $schemaManager->listTableColumns($this->getMetaModel()->getTableName());
  
          // Try to delete the column. If it does not exist as we can assume it has been deleted already then.
          if ($this->getColName() && isset($columns[$this->getColName()])) {
              $this->tableManipulator->dropColumn($this->getMetaModel()->getTableName(), $this->getColName());
          }
      }
docs: Removes the underlying database structure for this field.
  
  @return void