openinx commented on issue #2738:
URL: https://github.com/apache/iceberg/issues/2738#issuecomment-868349637
I had a test in spark3:
```bash
CREATE TABLE loc(
id LONG NOT NULL,
location STRUCT<lat:DOUBLE NOT NULL, long:DOUBLE NOT NULL>
);
INSERT INTO loc VALUES (1, null);
> SELECT * FROM loc;
1 NULL
Time taken: 0.374 seconds, Fetched 1 row(s)
> SELECT location.lat FROM loc;
NULL
Time taken: 0.22 seconds, Fetched 1 row(s)
```
So it will get a `NULL` value when projecting the required `location.lat`
from optional `location` struct.
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