[wp-trac] [WordPress Trac] #38200: Store a `comment_type` for all Comments, not just custom comment types

[WordPress Trac]

#38200: Store a `comment_type` for all Comments, not just custom comment types
-------------------------+-----------------------------
 Reporter:  rachelbaker  |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Comments     |    Version:
 Severity:  normal       |   Keywords:  needs-patch
  Focuses:               |
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 Currently the `comment_type` column for the comments table only stores a
 value (like `trackback` or `pingback`) when an irregular comment object is
 added.  Standard comments are stored with a `comment_type` of `''`.

 {{{
 #!mysql
 SELECT * FROM `wp_comments` WHERE `comment_type` = ' ';
 }}}
 This isn't very intuitive, and does not follow the expectations set by the
 `post_type` column in the posts table.

 Changing to storing a `comment_type` value for all comments is also pre-
 requisite for supporting custom comment types (see #35214).

 This change will require an upgrade routine as well as some back-compat
 work.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38200>
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