While working on a patch these days, my eyes are on the “alter table” doc, and found multiple errors:
1. Several sub-commands are missed in the top “action” list:
* ALTER COLUMN SET <sequence-option>
* ALTER COLUMN RESTART
* RENAME
* SET SCHEMA
* ATTACH PARTITION
* DETACH PARTITION
* MERGE PARTITION
* SPLIT PARTITION
2. In sub-command details section, "ADD COLUMN [ IF NOT EXISTS ]” missed “[]" with “COLUMN”, which is misleading, because “COLUMN” is actually optional.
3. For all “alter column” sub-commands, "ALTER [ COLUMN ]” are omitted, which is also confusing, because none of other sub-commands omit their prefix part.
