[Feature](lance) Support additional Lance and Arrow data types
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area/catalog
kind/feature
- Dominant language
- Java
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Description
## Parent
Tracked by #66340. Core Arrow and Lance scalar, nested, and vector types were introduced by #65730.
## Scope
- [ ] Lance Blob v2.
- [ ] Arrow JSON Extension.
- [ ] Lance BFloat16 Extension.
- [ ] Arrow null.
- [ ] Arrow duration.
- [ ] Preserve extension metadata and define Doris type mappings and unsupported-column behavior.
## Completion criteria
- [ ] FE schema conversion and BE Arrow deserialization are implemented safely.
- [ ] Unit and regression tests cover schema discovery, projection, nullability, and malformed input.
- [ ] User documentation describes mappings, precision, and limitations.
- [ ] Representative datasets for every listed type are verified.
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Assessment
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