[ARROW-10298] [Rust] Incorrect offset handling in iterator over dictionary keys

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0
• Component/s: Rust
• External issue URL: https://github.com/apache/arrow/issues/26289
• Assignee: Unassigned
• Reporter: Jörn Horstmann
• Created: 13/Oct/20 13:16
• Updated: 11/Jan/23 08:12
• Resolved: 03/Feb/21 13:01

Description

The NullableIterator used by DictionaryArray.keys calls ArrayData.is_null without taking the offset of that ArrayData into account. It would probably be better if ArrayData itself handled the offset in that method.

The iterator implementation could now also be replaced with the PrimitiveIter that was recently added