COLUMN_FORMAT 的值：FIXED、DYNAMIC、DEFAULT 的区别（待补充）

• 参考===MySQL 建表语句 create table 中的列定义：

column_definition:
    data_type [NOT NULL | NULL] [DEFAULT default_value]
      [AUTO_INCREMENT] [UNIQUE [KEY]] [[PRIMARY] KEY]
      [COMMENT 'string']
      [COLUMN_FORMAT {FIXED|DYNAMIC|DEFAULT}]
      [reference_definition]
  | data_type [GENERATED ALWAYS] AS (expression)
      [VIRTUAL | STORED] [NOT NULL | NULL]
      [UNIQUE [KEY]] [[PRIMARY] KEY]
      [COMMENT 'string']