rdblue commented on code in PR #5234:
URL: https://github.com/apache/iceberg/pull/5234#discussion_r1083101029


##########
core/src/main/java/org/apache/iceberg/BaseRowDelta.java:
##########
@@ -96,23 +97,37 @@ public RowDelta validateNoConflictingDeleteFiles() {
   }
 
   @Override
-  protected void validate(TableMetadata base, Snapshot snapshot) {
-    if (base.currentSnapshot() != null) {
+  public RowDelta toBranch(String branch) {
+    targetBranch(branch);
+    return this;
+  }
+
+  @Override
+  protected void validate(TableMetadata base, Snapshot parent) {
+    if (parent != null) {
+      if (startingSnapshotId != null) {
+        Preconditions.checkArgument(
+            SnapshotUtil.isAncestorOf(parent.snapshotId(), startingSnapshotId, 
base::snapshot),
+            "Snapshot %s is not an ancestor of %s",

Review Comment:
   I think a bit more context would be helpful if you ever encounter this 
error. `"Cannot validate changes: starting snapshot %s is not an ancestor of 
parent snapshot %s (branch %s)"`



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