ferhatelmas commented on code in PR #1871:
URL: https://github.com/apache/iceberg-go/pull/1871#discussion_r3848035873


##########
table/snapshots.go:
##########
@@ -272,9 +272,27 @@ type Snapshot struct {
 func (s *Snapshot) UnmarshalJSON(data []byte) error {
        type Alias Snapshot
        var next Alias
-       if err := json.Unmarshal(data, &next); err != nil {
+       // snapshot-id and timestamp-ms are required by the spec for every 
format
+       // version. Decode them through pointers so an absent or null field 
stays
+       // distinguishable from an explicit zero, which would otherwise be 
accepted
+       // as a valid identity or as the Unix epoch.
+       aux := struct {
+               SnapshotID  *int64 `json:"snapshot-id"`
+               TimestampMs *int64 `json:"timestamp-ms"`

Review Comment:
   specifically for snapshot, how about manifests or manifest-list required 
check here?



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