Yikf commented on PR #40699:
URL: https://github.com/apache/spark/pull/40699#issuecomment-1504461118
> The change LGTM. Can we also check other systems like Preso/Trino/Impala
and see how they display null values?
>
> cc @HyukjinKwon @viirya
> > The change LGTM. Can we also check other systems like Preso/Trino/Impala
and see how they display null values?
>
> @Yikf Can you help check Preso/Trino ? Also check PostgreSQL?
Sure, Aa following,
**Trino**
```shell
trino> select ARRAY[1, null];
_col0
-----------
[1, NULL]
(1 row)
Query 20230412_023104_00007_unnu6, FINISHED, 1 node
Splits: 1 total, 1 done (100.00%)
0.03 [0 rows, 0B] [0 rows/s, 0B/s]
trino> select null;
_col0
-------
NULL
(1 row)
Query 20230412_023108_00008_unnu6, FINISHED, 1 node
Splits: 1 total, 1 done (100.00%)
0.07 [0 rows, 0B] [0 rows/s, 0B/s]
```
**PostgreSQL**
```shell
postgres=# select array[1, null];
array
----------
{1,NULL}
(1 row)
```
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