nastra commented on code in PR #8797:
URL: https://github.com/apache/iceberg/pull/8797#discussion_r1354492487


##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/actions/RewriteDataFilesSparkAction.java:
##########
@@ -146,13 +148,29 @@ public RewriteDataFilesSparkAction filter(Expression 
expression) {
     return this;
   }
 
+  @Override
+  public RewriteDataFiles targetBranch(String branch) {
+    this.targetBranch = branch;
+    return this;
+  }
+
+  protected long startingSnapshotId() {
+    if (SnapshotRef.MAIN_BRANCH.equals(this.targetBranch)) {
+      return table.currentSnapshot().snapshotId();
+    } else {
+      SnapshotRef ref = table.refs().get(this.targetBranch);
+      Preconditions.checkArgument(ref != null, "branch must exist");

Review Comment:
   also shouldn't this check rather go into `targetBranch(...)`?



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