sunchao commented on a change in pull request #35483:
URL: https://github.com/apache/spark/pull/35483#discussion_r804439406



##########
File path: 
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/WritableColumnVector.java
##########
@@ -661,21 +671,22 @@ public final int appendArray(int length) {
    * common non-struct case.
    */
   public final int appendStruct(boolean isNull) {
+    reserve(elementsAppended + 1);
     if (isNull) {
       // This is the same as appendNull but without the assertion for struct 
types
-      reserve(elementsAppended + 1);
       putNull(elementsAppended);
-      elementsAppended++;
       for (WritableColumnVector c: childColumns) {
-        if (c.type instanceof StructType) {
+        if (c.isStruct()) {
           c.appendStruct(true);
         } else {
           c.appendNull();

Review comment:
       Sure, updated.




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