neilconway opened a new issue, #25505:
URL: https://github.com/apache/datafusion/issues/25505
### Describe the bug
Similar to #25419 and #25293
### To Reproduce
```sql
CREATE TABLE t AS SELECT named_struct('a', 1, 'b', 'x') AS s;
-- nullif only clears the struct's validity bit; the child arrays still hold
1 and 'x'
SELECT s IS NULL AS is_null,
xxhash64(s) AS masked_null,
xxhash64(arrow_cast(NULL, 'Struct("a": Int64, "b": Utf8)')) AS
plain_null
FROM (SELECT nullif(s, s) AS s FROM t);
```
```
$ cargo run --bin datafusion-cli -- --spark -f repro.sql
+---------+---------------------+------------+
| is_null | masked_null | plain_null |
+---------+---------------------+------------+
| true | 6158280145716684778 | 42 |
+---------+---------------------+------------+
```
### Expected behavior
_No response_
### Additional context
_No response_
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