Initial-neko opened a new issue #3617:
URL: https://github.com/apache/iceberg/issues/3617
When a field is nullable, SparkSQL cannot change this field to (not null)
refer to this SQL:
```
create table test_null2 (id INT NOT NULL, data int, data2 int) using iceberg;
alter table test_null2 alter column id set not null;
alter table test_null2 alter column id drop not null;
alter table test_null2 alter column id set not null; (error)
alter table test_null2 alter column data set not null;(error)
```
this is an empty table, Moreover, iceberg can support schema changes
I can change this though iceberg API like this：
`table.updateSchema().allowIncompatibleChanges().requireColumn("data").commit();`
can someone know how to use SQL changing this field null property？
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