paf31 opened a new issue, #11773:
URL: https://github.com/apache/datafusion/issues/11773
### Describe the bug
I cannot use `UNNEST` inside a subquery:
```sql
> SELECT id, (SELECT * FROM UNNEST(arr) LIMIT 1) FROM
(
SELECT 1 id, array [1, 2] arr
UNION
SELECT 2 id, array [] arr
) rows;
check_analyzed_plan
caused by
Error during planning: Unsupported operator in the subquery plan.
```
Nor can I use `UNNEST` in a subquery on the right hand side of `EXISTS`:
```sql
> SELECT id FROM
(
SELECT 1 id, array [1, 2] arr
UNION
SELECT 2 id, array [] arr
) rows
WHERE EXISTS (SELECT 1 FROM UNNEST(arr));
check_analyzed_plan
caused by
Error during planning: Unsupported operator in the subquery plan.
```
### To Reproduce
The queries above can be used in `datafusion-cli`.
### Expected behavior
The queries above should ideally work like they do in Postgres (with some
type annotations):
```sql
# SELECT id, (SELECT * FROM UNNEST(arr) LIMIT 1) FROM (SELECT 1 id, array
[1, 2] arr UNION
SELECT 2 id, array [] :: integer[] arr) rows;
id | unnest
----+--------
1 | 1
2 |
(2 rows)
# SELECT id FROM (SELECT 1 id, array [1, 2] arr UNION SELECT 2 id, array []
:: integer[] arr) rows WHERE EXISTS (SELECT 1 FROM UNNEST(arr));
id
----
1
(1 row)
```
### Additional context
Sorry if this is already tracked. It seems like there is a missing case in
this function, and if this is a simple fix then I'd be happy to try to make a
PR:
https://github.com/apache/datafusion/blob/ae2ca6a0e21b77bba1ac40ea6ee059e47d0791e0/datafusion/optimizer/src/analyzer/subquery.rs#L233
Thanks!
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