twuebi commented on code in PR #585:
URL: https://github.com/apache/iceberg-go/pull/585#discussion_r2413735972
##########
table/metadata.go:
##########
@@ -1670,6 +1711,106 @@ func (m *metadataV2) checkLastSequenceNumber() error {
return nil
}
+// metadataV3 represents table metadata for format version 3
+type metadataV3 struct {
+ LastSeqNum int64 `json:"last-sequence-number"`
+ NextRowIDValue int64 `json:"next-row-id"`
+
+ commonMetadata
+}
+
+func initMetadataV3Deser() *metadataV3 {
+ return &metadataV3{
+ LastSeqNum: -1,
+ NextRowIDValue: -1,
+ commonMetadata: initCommonMetadataForDeserialization(),
+ }
+}
+
+func (m *metadataV3) LastSequenceNumber() int64 { return m.LastSeqNum }
+func (m *metadataV3) NextRowID() int64 {
+ if m.NextRowIDValue == -1 {
+ return 0 // RFor v1/v2 compatibility when field is missing
+ }
+ return m.NextRowIDValue
+}
+
+func (m *metadataV3) Equals(other Metadata) bool {
+ rhs, ok := other.(*metadataV3)
+ if !ok {
+ return false
+ }
+
+ if m == rhs {
+ return true
+ }
+
+ return m.LastSeqNum == rhs.LastSeqNum &&
+ m.NextRowIDValue == rhs.NextRowIDValue &&
+ m.commonMetadata.Equals(&rhs.commonMetadata)
+}
+
+func (m *metadataV3) UnmarshalJSON(b []byte) error {
+ type Alias metadataV3
+ aux := (*Alias)(m)
+
+ // Set LastColumnId to -1 to indicate that it is not set as
LastColumnId = 0 is a valid value for when no schema is present
+ aux.LastColumnId = -1
+
+ if err := json.Unmarshal(b, aux); err != nil {
+ return err
+ }
+
+ m.preValidate()
+
+ return m.validate()
+}
+
+func (m *metadataV3) validate() error {
+ if err := m.checkLastSequenceNumber(); err != nil {
+ return err
+ }
+
+ if err := m.checkNextRowID(); err != nil {
+ return err
+ }
+
+ if err := m.commonMetadata.validate(); err != nil {
+ return err
+ }
+
+ return nil
+}
+
+func (m *metadataV3) checkLastSequenceNumber() error {
+ for _, snap := range m.SnapshotList {
+ if snap.SequenceNumber > m.LastSequenceNumber() {
+ return fmt.Errorf("%w: snapshot %d has sequence number
%d which is greater than last-sequence-number %d",
+ ErrInvalidMetadata, snap.SnapshotID,
snap.SequenceNumber, m.LastSequenceNumber())
+ }
+ }
+
+ return nil
+}
Review Comment:
Is there a way to not have this function twice? maybe by defining another
interface which defines a func LastSequenceNumber() and implements this which
would be part of both metadata v2 & v3?
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