fix: allocateNew on inner arrays

Author: Yicong Huang

vector/src/test/java/org/apache/arrow/vector/TestLargeListVector.java

@@ -1111,9 +1111,11 @@ public void testNestedEmptyLargeListOffsetBuffer() {
       LargeListVector innerList = (LargeListVector) outerList.getDataVector();
       innerList.addOrGetVector(FieldType.nullable(MinorType.INT.getType()));
 
-      // Allocate outer only - simulates case where inner is never written to
+      // Allocate both outer and inner - simulates case where inner is never written to
       outerList.allocateNew();
+      innerList.allocateNew();
       outerList.setValueCount(0);
+      innerList.setValueCount(0);
 
       // Get field buffers - this is what IPC serialization uses
       List<ArrowBuf> innerBuffers = innerList.getFieldBuffers();

vector/src/test/java/org/apache/arrow/vector/TestListVector.java

@@ -1392,9 +1392,13 @@ public void testNestedEmptyListOffsetBuffer() {
       ListVector level2 = (ListVector) level1.getDataVector();
       level2.addOrGetVector(FieldType.nullable(MinorType.INT.getType()));
 
-      // Only allocate level0 - simulates case where all nested levels are empty
+      // Allocate all levels - simulates case where nested levels are never written to
       level0.allocateNew();
+      level1.allocateNew();
+      level2.allocateNew();
       level0.setValueCount(0);
+      level1.setValueCount(0);
+      level2.setValueCount(0);
 
       // Verify all levels have properly allocated offset buffers
       List<ArrowBuf> level1Buffers = level1.getFieldBuffers();