Github user sudheeshkatkam commented on the issue:
https://github.com/apache/drill/pull/567
Per [Hakkim's
comment](https://github.com/apache/drill/pull/460/files#diff-158c887d198393117d3a1bbc42114a8bR344),
SYSTEM type is meant for unexpected errors that do not have a "nice" error
message yet. However in some error cases on the client side, there can be nice
error messages, as shown in these changes.
Regarding compatibility: the server should not produce CLIENT type user
exceptions, so old clients can talk to new servers; mentioned in the CLIENT
type description as _some error on the client side_.
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