public function addCol(
        /*# string */ $colName,
        /*# string */ $colType
    ) {
        $def = [
            'name' => $colName,
            'type' => $colType
        ];
        $this->col_defs[] = $def;
        return $this;
    }
public function addCol(
        /*# string */ $colName,
        /*# string */ $colType
    ) {
        $def = [
            'name' => $colName,
            'type' => $colType
        ];
        $this->col_defs[] = $def;
        return $this;
    }
{@inheritDoc}