rdblue commented on code in PR #4926:
URL: https://github.com/apache/iceberg/pull/4926#discussion_r889296626


##########
core/src/main/java/org/apache/iceberg/SnapshotProducer.java:
##########
@@ -298,11 +306,11 @@ public void commit() {
             TableMetadata.Builder update = TableMetadata.buildFrom(base);
             if (base.snapshot(newSnapshot.snapshotId()) != null) {
               // this is a rollback operation
-              update.setBranchSnapshot(newSnapshot.snapshotId(), 
SnapshotRef.MAIN_BRANCH);
+              update.setBranchSnapshot(newSnapshot.snapshotId(), branch);
             } else if (stageOnly) {
               update.addSnapshot(newSnapshot);
             } else {
-              update.setBranchSnapshot(newSnapshot, SnapshotRef.MAIN_BRANCH);
+              update.setBranchSnapshot(newSnapshot.snapshotId(), branch);

Review Comment:
   I think this correctly writes to the branch, but I think we also need to 
check validations. That probably means copying _all_ the tests for every table 
operation and running them to make sure they work when writing to a branch.



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