nssalian commented on code in PR #2002:
URL: https://github.com/apache/iceberg-go/pull/2002#discussion_r4040102130


##########
table/arrow_utils.go:
##########
@@ -436,7 +436,7 @@ func (c convertToIceberg) Primitive(dt arrow.DataType) 
(result iceberg.NestedFie
                switch dt.ExtensionName() {
                case "arrow.uuid":
                        result.Type = iceberg.PrimitiveTypes.UUID
-               case "parquet.variant":
+               case extensions.VariantExtensionName, 
extensions.LegacyVariantExtensionName:

Review Comment:
   I agree and this reader accepts both names so it won't hit that path. The 
crash you described here is an old 18.7 iceberg-go reader on a new file during 
the upgrade window . We can't patch already-released readers; accepting both 
names here is the forward mitigation I think we should do. Kept the compat note 
in the PR description since there's no in-repo changelog. Can we add this in 
the Release notes instead so users are aware?



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