Github user omalley commented on a diff in the pull request:
https://github.com/apache/orc/pull/132#discussion_r122580741
--- Diff: proto/orc_proto.proto ---
@@ -221,15 +227,32 @@ message PostScript {
// [0, 12] = Hive 0.12
repeated uint32 version = 4 [packed = true];
optional uint64 metadataLength = 5;
- // Version of the writer:
- // 0 (or missing) = original
- // 1 = HIVE-8732 fixed
- // 2 = HIVE-4243 fixed
- // 3 = HIVE-12055 fixed
- // 4 = HIVE-13083 fixed
- // 5 = ORC-101 fixed
- // 6 = ORC-135 fixed
+
+ // The version of the writer that wrote the file. This number is
+ // updated when we make fixes or large changes to the writer so that
+ // readers can detect whether a given bug is present in the data.
+ //
+ // These numbers are assigned from 6 per a writer so that readers that
+ // predate ORC-202 treat the new writers correctly.
--- End diff --
Ok, I tried to make the comment in the protobuf clearer.
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