ConeyLiu opened a new issue, #4626:
URL: https://github.com/apache/iceberg/issues/4626
Code to reproduce:
```scala
scala> case class Data(id: Long, name: String)
scala> case class Item(id: Long, data: Data)
scala> spark.sql("create table local.db.test_table(id long, data struct<id:
long, name: string>) using iceberg partitioned by (identity(data.name))").show()
scala> spark.range(5).map(i => Item(i, Data(i,
s"${i}"))).writeTo("local.db.test_table").append()
scala> spark.sql("select data.name from local.db.test_table").show()
+----+
|name|
+----+
|null|
|null|
|null|
|null|
|null|
+----+
```
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