amogh-jahagirdar commented on code in PR #16688:
URL: https://github.com/apache/iceberg/pull/16688#discussion_r3375145472
##########
core/src/main/java/org/apache/iceberg/TrackedFile.java:
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@@ -49,6 +49,9 @@ interface TrackedFile {
Types.NestedField FILE_SIZE_IN_BYTES =
Types.NestedField.required(
104, "file_size_in_bytes", Types.LongType.get(), "Total file size in
bytes");
+ Types.NestedField WRITER_FORMAT_VERSION =
+ Types.NestedField.required(
Review Comment:
Let me make sure the doc is up to date, but I think it's best for this to be
a required field. We always know if a manifest is `pre-v4` or if it's v4. On
upgrade, a writer would just need to write the existing leaf manifests with
pre-v4 in the root. I feel like there's no reason for it to not be required,
it's known by writers and easy to determine and the storage level . If we made
it optional, it basically makes it impossible for readers to really know
without poking at the schema / checking k/v metadata.
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