lingbin opened a new pull request #2960: Assign each status type an constant explicitly URL: https://github.com/apache/incubator-doris/pull/2960 The `TStatusCode` struct is used in all FEs and BEs. In order to be able to avoid errors when identifying status_codes in RPC when upgrading Doris (update and restart the servers one by one), we must ensure that each element always a fixed value. If each element is not explicitly assigned a constant, then the value of each element will be assigned from 0 in turn, which will need us to be very careful when adding and removing elements, to avoid the same element on different machines to be recognized as a different value. i.e., new elements can only be added to the end, and only elements at the end can be deleted. Unfortunately, this implicit constraint is likely to be ignored by programmers when coding, especially those who are new to Doris. No functional change in this patch.
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