mysql_prepare_alter_table() create_table_impl() fill_alter_inplace_info() ha_innobase::check_if_supported_inplace_alter() mysql_inplace_alter_table() // if support ...

A column is auto-increment, and i tried to insert a row,but if i don't set the auto-increment column's vlaue, insert will fail.Then i set a value to that column,but if i don't change value ...