[GitHub] [arrow-rs] alamb commented on a change in pull request #1457: Fix generate_map_case

[GitBox <gi...@apache.org>]

alamb commented on a change in pull request #1457:
URL: https://github.com/apache/arrow-rs/pull/1457#discussion_r829073918



##########
File path: integration-testing/src/lib.rs
##########
@@ -569,6 +569,31 @@ fn array_from_json(
             }
             Ok(Arc::new(b.finish()))
         }
+        DataType::Map(child_field, _) => {
+            let null_buf = create_null_buf(&json_col);
+            let children = json_col.children.clone().unwrap();
+            let child_array = array_from_json(
+                child_field,
+                children.get(0).unwrap().clone(),

Review comment:
       how do we know there is exactly one child in this case?




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