findepi opened a new issue, #16134:
URL: https://github.com/apache/datafusion/issues/16134
### Describe the bug
When subquery is used in expression context, it must be a scalar subquery,
i.e. it must produce a singe column and _at most_ one row.
### To Reproduce
```
SELECT
s.*,
-- not a scalar subquery
(SELECT * FROM (VALUES (1), (2)) t(x)) sub
FROM (VALUES ('a'), ('b')) s(a);
```
```
+---+-----+
| a | sub |
+---+-----+
| a | 1 |
| a | 2 |
| b | 1 |
| b | 2 |
+---+-----+
```
### Expected behavior
an error like the one produced by e.g. Snowflake "Single-row subquery
returns more than one row."
### Additional context
_No response_
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