maropu commented on pull request #29311:
URL: https://github.com/apache/spark/pull/29311#issuecomment-667427163
Looks a reasonable change. Actually, hive does so;
```
hive> select named_struct('a', 1, 'b', null);
{"a":1,"b":null}
hive> select array(1, 2, null);
[1,2,null]
hive> select map('a', 1, 'b', null);
{"a":1,"b":null}
```
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