Hoeze opened a new issue, #11370:
URL: https://github.com/apache/arrow-rs/issues/11370
### Is your feature request related to a problem or challenge?
Arrow has no canonical type for ranges, i.e. intervals with a lower and an
upper bound. apache/arrow#50027 proposes two canonical extension types for
them, and apache/arrow#50028 adds the spec text and the C++ and Python
implementations. The proposal is being discussed on the Arrow dev mailing
list, and a vote will follow.
### Describe the solution you'd like
Support both types in `arrow-schema`, like the other canonical extension
types:
- `arrow.fixed_closedness_range`: storage `Struct<lower: T, upper: T>`,
metadata `{"closed": "left" | "right" | "both" | "neither"}`. All values
share one closedness.
- `arrow.variable_closedness_range`: storage
`Struct<lower: T, upper: T, lower_inc: Boolean not null, upper_inc:
Boolean not null>`,
metadata `{}`. The inclusivity of each bound is stored per value.
This would also give the proposal its second implementation, which the
canonical extension type process asks for when a type has parameters.
### Describe alternatives you've considered
Defining the types as user extension types outside arrow-rs. That works, but
other crates could not rely on a shared definition.
### Additional context
- Spec and C++/Python implementation: apache/arrow#50028
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