{"action":"created","comment":{"url":"https://api.github.com/repos/cockroachdb/cockroach/pulls/comments/41794190","id":41794190,"diff_hunk":"@@ -134,15 +137,23 @@ var binOps = map[binArgs]binOp{\n \t\t},\n \t},\n \tbinArgs{Plus, dateType, intervalType}: {\n-\t\treturnType: DummyTimestamp,\n+\t\treturnType: DummyDate,\n \t\tfn: func(left Datum, right Datum) (Datum, error) {\n-\t\t\treturn DTimestamp{Time: left.(DDate).Add(right.(DInterval).Duration)}, nil\n+\t\t\tdays, err := inDays(right.(DInterval).Duration)\n+\t\t\tif err != nil {\n+\t\t\t\treturn DummyDate, err\n+\t\t\t}\n+\t\t\treturn DDate(left.(DDate) + days), nil","path":"sql/parser/eval.go","position":22,"original_position":22,"commit_id":"c258a09c8add15bee6d3d73666d90c6a916ae31a","original_commit_id":"c258a09c8add15bee6d3d73666d90c6a916ae31a","user":{"login":"bdarnell","id":160562,"avatar_url":"https://avatars.githubusercontent.com/u/160562?v=3","gravatar_id":"","url":"https://api.github.com/users/bdarnell","html_url":"https://github.com/bdarnell","followers_url":"https://api.github.com/users/bdarnell/followers","following_url":"https://api.github.com/users/bdarnell/following{/other_user}","gists_url":"https://api.github.com/users/bdarnell/gists{/gist_id}","starred_url":"https://api.github.com/users/bdarnell/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bdarnell/subscriptions","organizations_url":"https://api.github.com/users/bdarnell/orgs","repos_url":"https://api.github.com/users/bdarnell/repos","events_url":"https://api.github.com/users/bdarnell/events{/privacy}","received_events_url":"https://api.github.com/users/bdarnell/received_events","type":"User","site_admin":false},"body":"@vivekmenezes's point (with this change; I also don't understand \"forget about intervals\") is that adding an interval to a `DATE` is a kind of implicit cast (unless that interval is an integer number of days), just like adding an int and a float. It would be more consistent with our stance on implicit casts elsewhere to require the date to be explicitly cast to a timestamp (even though it is inconsistent with 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