namrathamyske commented on code in PR #6651:
URL: https://github.com/apache/iceberg/pull/6651#discussion_r1115139698


##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkTable.java:
##########
@@ -250,7 +251,9 @@ public ScanBuilder newScanBuilder(CaseInsensitiveStringMap 
options) {
   @Override
   public WriteBuilder newWriteBuilder(LogicalWriteInfo info) {
     Preconditions.checkArgument(
-        snapshotId == null, "Cannot write to table at a specific snapshot: 
%s", snapshotId);
+        snapshotId == null || info.options().get(SparkWriteOptions.BRANCH) != 
null,

Review Comment:
   I think if branch is set, it snapshot ID will be set to branch head in code. 
But we can add an additional check too.



##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkTable.java:
##########
@@ -250,7 +251,9 @@ public ScanBuilder newScanBuilder(CaseInsensitiveStringMap 
options) {
   @Override
   public WriteBuilder newWriteBuilder(LogicalWriteInfo info) {
     Preconditions.checkArgument(
-        snapshotId == null, "Cannot write to table at a specific snapshot: 
%s", snapshotId);
+        snapshotId == null || info.options().get(SparkWriteOptions.BRANCH) != 
null,

Review Comment:
   I think if branch is set, snapshot ID will be set to branch head in code. 
But we can add an additional check too.



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