code: public function char($length = null)
      {
          return $this->getDb()->getSchema()->createColumnSchemaBuilder(Schema::TYPE_CHAR, $length);
      }
docs: Creates a char column.
  @param int $length column size definition i.e. the maximum string length.
  This parameter will be ignored if not supported by the DBMS.
  @return ColumnSchemaBuilder the column instance which can be further customized.
  @since 2.0.8