[I] [EPIC] [Parquet] Variant improvements and optimizations (not gating stabilization) [arrow-rs]

["sdf-jkl (via GitHub)" <gi...@apache.org>]

sdf-jkl opened a new issue, #10547:
URL: https://github.com/apache/arrow-rs/issues/10547

   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   Companion to https://github.com/apache/arrow-rs/issues/10546, which tracks the work gating the `variant_experimental` flag switch. This epic collects Variant work that is worth doing but does not block stabilization: performance, ergonomics, and internal consolidation.
   
   **Optimizations**
   - [ ] https://github.com/apache/arrow-rs/pull/10358
   - [ ] https://github.com/apache/arrow-rs/pull/9862 (cast perfectly shredded children directly, closed for now, to be revived once the cast alignment under https://github.com/apache/arrow-rs/issues/8982 lands)
   - [ ] https://github.com/apache/arrow-rs/issues/8153 (achievable today by chaining `variant_get` + `shred_variant`, direct reshredding is an optimization)
   - [ ] https://github.com/apache/arrow-rs/issues/8323
   - [ ] https://github.com/apache/arrow-rs/issues/7960
   
   **Ergonomics and internals**
   - [ ] https://github.com/apache/arrow-rs/issues/9519 (achievable today with multiple `variant_get` calls + manual assembly)
   - [ ] https://github.com/apache/arrow-rs/issues/9633
   - [ ] https://github.com/apache/arrow-rs/issues/8605
   - [ ] https://github.com/apache/arrow-rs/issues/8987
   


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