Github user julienledem commented on a diff in the pull request:
https://github.com/apache/drill/pull/207#discussion_r42252771
--- Diff: protocol/src/main/protobuf/Types.proto ---
@@ -73,6 +74,7 @@ message MajorType {
optional int32 precision = 4; // used for decimal types
optional int32 scale = 5; // used for decimal types
optional int32 timeZone = 6; // used by TimeStamp type
+ repeated MinorType sub_type = 7; // used by Union type
--- End diff --
Why do we need this for Union when we don't need it for other complex types
(LIST, MAP, ...)
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