code: protected function buildLengthString()
      {
          if ($this->length === null || $this->length === []) {
              return '';
          }
          if (is_array($this->length)) {
              $this->length = implode(',', $this->length);
          }
  
          return "({$this->length})";
      }
docs: Builds the length/precision part of the column.
  @return string