TruncateTransform.satisfies_order_of raises AttributeError for different widths

Bắt đầu trong pyiceberg/transforms.py tại TruncateTransform.satisfies_order_of và xem xét constructor liên quan cùng thuộc tính source_type. Chạy các trường hợp tập trung trong tests/test_transforms.py quanh các dòng 501-512, sau đó thêm coverage cho các width khác nhau. Hoàn tất khi các phép so sánh trả về các giá trị boolean mong đợi mà không truy cập vào một thuộc tính chưa được khởi tạo.

Apache Iceberg version

0.11.0 (latest release)

Please describe the bug 🐞

Description

Calling TruncateTransform.satisfies_order_of with two valid truncate transforms that have different widths raises an AttributeError instead of returning a boolean.

Same-width comparisons work because the method returns early when the transforms are equal.

Reproduction

from pyiceberg.transforms import TruncateTransform

TruncateTransform(5).satisfies_order_of(TruncateTransform(3))

On main at commit 48e710d20ceeeaa637d5aeae7746b787410859f8, this raises:

AttributeError: 'TruncateTransform' object has no attribute '_source_type'

The failure reproduces consistently. The same code is also present in the 0.11.1 release.

Expected behavior

The method should compare the truncate widths and return a boolean:

assert TruncateTransform(5).satisfies_order_of(TruncateTransform(3))
assert not TruncateTransform(3).satisfies_order_of(TruncateTransform(5))

This matches the current Apache Iceberg Java implementation:

https://github.com/apache/iceberg/blob/25654ab4b29c8b5b5c20fc427da01cb70d94ed14/api/src/main/java/org/apache/iceberg/transforms/Truncate.java#L130-L141

Cause

TruncateTransform.__init__ initializes _width but not _source_type. However, satisfies_order_of still accesses the source_type property backed by _source_type:

https://github.com/apache/iceberg-python/blob/48e710d20ceeeaa637d5aeae7746b787410859f8/pyiceberg/transforms.py#L783-L905

The existing unit test only compares a transform with itself, so it returns before reaching the failing branch:

https://github.com/apache/iceberg-python/blob/48e710d20ceeeaa637d5aeae7746b787410859f8/tests/test_transforms.py#L501-L512

A focused fix could compare TruncateTransform widths directly, consistent with the Java implementation, and add regression cases for different widths.

I would be happy to contribute the fix and regression tests.

Willingness to contribute

• I can contribute a fix for this bug independently
• I would be willing to contribute a fix for this bug with guidance from the Iceberg community
• I cannot contribute a fix for this bug at this time