sakshichitnis27 opened a new pull request, #23686:
URL: https://github.com/apache/datafusion/pull/23686
Fixes #23666
## Summary
- Add an optimizer-local helper for schema-aware direct-child rewrites.
- Recompute a parent schema only when a rewritten child’s schema changes.
- Migrate `EliminateCrossJoin` to use the helper.
- Preserve existing in-place optimizer schema protection.
- Add tests for schema-changing and schema-preserving child rewrites.
This is an internal optimizer refactor and does not change SQL-visible
behavior.
## Testing
- `cargo fmt --all --check`
- `cargo test -p datafusion-optimizer`
The optimizer tests passed, including unit tests, integration tests, and
doctests.
`cargo clippy` is currently blocked by an unrelated existing `dead_code`
error in
`datafusion-physical-expr`.
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