[GitHub] [flink] yuchuanchen commented on a diff in pull request #20616: [FLINK-29005][Connectors/Parquet] Parquet row type reader should not return null value when some child fields is null

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yuchuanchen commented on code in PR #20616:
URL: https://github.com/apache/flink/pull/20616#discussion_r952082659


##########
flink-table/flink-table-common/src/main/java/org/apache/flink/table/data/columnar/vector/heap/HeapRowVector.java:
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@@ -46,4 +46,12 @@ public ColumnarRowData getRow(int i) {
         columnarRowData.setRowId(i);
         return columnarRowData;
     }
+
+    @Override
+    public void reset() {

Review Comment:
   There is no need to Override `HeapArrayVector` and `HeapMapVector`.
   
    In `ArrayColumnReader.fillColumnVector()`, the child of `HeapArrayVector` 
is always reset by  calling `setChild()`
   
![image](https://user-images.githubusercontent.com/9213476/186051604-bebd62cd-a0aa-448f-8484-b7aa181f8b62.png)
   
   `MapColumnReader` actually readToVector by creating 2 new ArrayColumnReader 
for each `readBatch()`.
   
![image](https://user-images.githubusercontent.com/9213476/186050844-1e3644e8-2817-4f9a-88c8-08e5a6005963.png)
   
   That's why Map and Array types do not occur this problem.
   



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