nbruno commented on a change in pull request #9151:
URL: https://github.com/apache/arrow/pull/9151#discussion_r583064206



##########
File path: java/vector/src/main/codegen/templates/UnionFixedSizeListWriter.java
##########
@@ -169,6 +169,29 @@ public StructWriter struct(String name) {
     return structWriter;
   }
 
+  @Override
+  public MapWriter map() {
+    return writer;
+  }
+
+  @Override
+  public MapWriter map(String name) {
+    MapWriter mapWriter = writer.map(name);
+    return mapWriter;
+  }
+
+  @Override
+  public MapWriter map(boolean keysSorted) {
+    writer.map(keysSorted);

Review comment:
       I tried digging into this a little bit more and stepped through what is 
done for list. I think? we are matching what is done for list, for example [see 
here](https://github.com/apache/arrow/blob/master/java/vector/src/main/codegen/templates/UnionListWriter.java#L162)
 where `list()` just returns the current `UnionListWriter`. Since we need 
`keysSorted` for map, there's an additional `map(boolean)` method, but just 
like `map()` we return the current writer. Appreciate any more insight you can 
provide here Bryan.




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