src/Attribute/BaseSimple.php
public function createColumn()
    {
        if ($this->getColName()) {
            $this->tableManipulator->createColumn(
                $this->getMetaModel()->getTableName(),
                $this->getColName(),
                $this->getSQLDataType()
            );
        }
    }
public function createColumn()
    {
        if ($this->getColName()) {
            $this->tableManipulator->createColumn(
                $this->getMetaModel()->getTableName(),
                $this->getColName(),
                $this->getSQLDataType()
            );
        }
    }
Creates the underlying database structure for this field.

You have to override this function in field types, when you want to have multi column structure etc.

@return void