code: protected function extractColumnSize($column, $dbType, $precision, $scale, $length)
      {
          $column->size = trim($length) === '' ? null : (int) $length;
          $column->precision = trim($precision) === '' ? null : (int) $precision;
          $column->scale = trim($scale) === '' ? null : (int) $scale;
      }
docs: Extracts size, precision and scale information from column's DB type.
  @param ColumnSchema $column
  @param string $dbType the column's DB type
  @param string $precision total number of digits.
  This parameter is available since version 2.0.4.
  @param string $scale number of digits on the right of the decimal separator.
  This parameter is available since version 2.0.4.
  @param string $length length for character types.
  This parameter is available since version 2.0.4.