Github user nongli commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10820#discussion_r50787370
  
    --- Diff: 
sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/ColumnarBatch.java
 ---
    @@ -170,12 +204,13 @@ public final CalendarInterval getInterval(int 
ordinal) {
     
         @Override
         public final InternalRow getStruct(int ordinal, int numFields) {
    -      throw new NotImplementedException();
    +      return 
ColumnVectorUtils.toRow(parent.column(ordinal).getStruct(rowId));
         }
     
         @Override
         public final ArrayData getArray(int ordinal) {
    -      throw new NotImplementedException();
    +      ColumnVector.Array array = parent.column(ordinal).getArray(rowId);
    +      return ColumnVectorUtils.toGenericArray(array);
    --- End diff --
    
    I think for this and getStruct, it will be too slow. We are materializing 
the collection which we should avoid if possible. 
    
    I think we need to clean up InternalRow's interface and then have getStruct 
return that. 


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