Structured Interval Native Type

[tustvold]

Placeholder needs fleshing out

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Currently interval types are represented as single primitive i64, i128, etc... This is despite them being composite types. The result is error prone, leading to incorrect overflow, parsing, etc... behaviour

Describe the solution you'd like

I would like to use a structured type as the native type for interval arrays, in a similae vein to the custom i256 type

Describe alternatives you've considered

Additional context

[tustvold]

This may fall out of the arrow2 integration work #1176

[tustvold]

This is blocked on #4733 as the kernels based around ToPrimitive will not work with a custom type

[alamb]

Proposed PR #5769