bk-mz opened a new pull request, #15079:
URL: https://github.com/apache/iceberg/pull/15079
### Description
This PR adds a test that reproduces a regression in Iceberg 1.10.0 where
`rewrite_position_delete_files` fails with `ValidationException` when the table
contains array columns with primitive fields.
**Error:**
```
org.apache.iceberg.exceptions.ValidationException: Invalid partition field
parent: list<struct<...>>
```
**Root cause:** `ExpressionUtil.identitySpec()` creates a temporary
partition spec from schema field IDs for filter projection. The
`nonConstantFieldIds()` method in `PositionDeletesRowReader` collects ALL
primitive field IDs including those nested inside arrays. When `identitySpec()`
tries to create identity partition fields for these nested IDs, the new
validation added in commit 9fb80b716 rejects them because their parent type is
a list, not a struct.
**Regression introduced by:** 9fb80b716 ("Core: Disallow creation of invalid
PartitionSpec #12887")
This test is expected to fail until the bug is fixed.
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