* - 1. change index default collation from "utf8_bin" to "A". - 2. show column comment. fix #4224. - 3. show table auto-increment. fix #3747.
* - 1. change index default collation from "utf8_bin" to "A". - 2. show column comment. fix #4224. - 3. show table auto-increment. fix #3747.