amogh-jahagirdar commented on code in PR #6651:
URL: https://github.com/apache/iceberg/pull/6651#discussion_r1114838347


##########
spark/v3.3/spark/src/main/java/org/apache/iceberg/spark/source/SparkPositionDeltaWriteBuilder.java:
##########
@@ -81,6 +82,11 @@ public DeltaWrite build() {
         handleTimestampWithoutZone || 
!SparkUtil.hasTimestampWithoutZone(table.schema()),
         SparkUtil.TIMESTAMP_WITHOUT_TIMEZONE_ERROR);
 
+    if (writeConf.branch().equalsIgnoreCase(SnapshotRef.MAIN_BRANCH)) {
+      throw new UnsupportedOperationException(
+          "Row level operations on non-main branches are currently 
unsupported");
+    }

Review Comment:
   @rdblue @aokolnychyi @namrathamyske So we'll throw (temporarily) if the 
branch option is set to a non-main branch.



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