Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/18460
Thank you for review, @gatorsmile . The following is a result from Hive
1.2.2.
```sql
hive> CREATE TABLE T AS SELECT named_struct('a',1);
hive> CREATE TABLE S AS SELECT named_struct('A',1);
hive> SELECT * FROM T UNION ALL SELECT * FROM S;
{"a":1}
{"a":1}
```
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