[PR] feat(core): port schema evolution for merged batches [hudi-rs]

["linliu-code (via GitHub)" <gi...@apache.org>]

linliu-code opened a new pull request, #643:
URL: https://github.com/apache/hudi-rs/pull/643

   **Stacked on #639–#642** — their commits appear here until they merge. **Review only the last commit.**
   
   Two modules that let a read span a schema change — the capability `hudi-rs` has no equivalent of today:
   
   - `schema::extended_promotion` — which type changes a read can absorb (int→long, decimal scale widening, …), rejecting the rest rather than producing a silently wrong value.
   - `schema::batch_evolution` — applies a target schema to a batch read under an older one: back-fill added columns as null, drop removed ones, cast promoted ones through the rules above.
   
   Together they are what makes a MOR slice readable when its base file and log blocks were written under different schemas.
   
   Nothing calls them yet. Build warning-free; 795 lib tests green.
   
   🤖 Generated with [Claude Code](https://claude.com/claude-code)


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Re: [PR] feat(core): port schema evolution for merged batches [hudi-rs]

["linliu-code (via GitHub)" <gi...@apache.org>]

linliu-code commented on PR #643:
URL: https://github.com/apache/hudi-rs/pull/643#issuecomment-5232820936

   Closing: this line is superseded.
   
   The merge-on-read work now lives on a single line (#663-#673, plus #675), which
   starts from the port as one squashed commit rather than this decomposition of
   it. That squashed commit contains everything this chain built, so nothing here
   is lost -- it is the same tree, reached by a different route.
   
   #660 carries the full squash for review, and is now up to date with the tip.


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Re: [PR] feat(core): port schema evolution for merged batches [hudi-rs]

["linliu-code (via GitHub)" <gi...@apache.org>]

linliu-code closed pull request #643: feat(core): port schema evolution for merged batches
URL: https://github.com/apache/hudi-rs/pull/643


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