Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/13976
Actually, that is not a bug, but I found that there exists a little
difference between Spark and Hive with the following query.
```
SELECT inline(array(struct(a), struct(b))) FROM (SELECT 1 a, 2 b) T
```
In short, Spark does more strict type-checking, e.g., `[struct<a:int>,
struct<b:int>]` is considered heterogeneous due to name difference.
I only add more tests to clarify the cases. We cannot touch that because it
depends on many things.
The following query is a workaround which both Spark/Hive work.
```
SELECT inline(array(struct(a), named_struct('a', b))) FROM (SELECT 1 a, 2
b) T
```
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