nickva commented on code in PR #4394:
URL: https://github.com/apache/couchdb/pull/4394#discussion_r1082853325
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src/mango/src/mango_cursor_view.erl:
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@@ -248,6 +266,19 @@ view_cb({row, Row}, #mrargs{extra = Options} = Acc) ->
key = couch_util:get_value(key, Row),
doc = couch_util:get_value(doc, Row)
},
+ % This supports receiving our "arguments" either as just the `selector`
+ % or in the new record in `callback_args`. This is to support mid-upgrade
+ % clusters where the non-upgraded coordinator nodes will send the older
style.
+ % TODO remove this in a couple of couchdb versions.
Review Comment:
We've been informally tagging those with "backwards compatibility" or
"upgrade clause" notes in the comments. Searching for "TODO" would work as
well. Some official marker would be better, of course.
Another way is to add a config parameter like we had for rexi use_kill_all
but there is a balance there.
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