[AURON #2001] Upgrade Rust nightly toolchain to 2025-12-15.

[slfan1989]

Which issue does this PR close?

Closes #2001

Rationale for this change

Upgrade the Rust nightly toolchain to incorporate compiler improvements, bug fixes, and optimizations from the past 45 days (2025-05-09 to 2025-12-15).

What changes are included in this PR?

• Update rust-toolchain.toml: nightly-2025-05-09 → nightly-2025-12-15
• All components (rust-src, cargo, rustfmt, clippy) remain unchanged

Are there any user-facing changes?

No.

How was this patch tested?

CI pipeline verification

[slfan1989]

@cxzl25 @richox Could you please review this PR? Thanks a lot!

[cxzl25]

I remember that using nightly-2025-06-20 would cause JVM crash. I am not sure if it has been fixed now.

#1126

[slfan1989]

I remember that using nightly-2025-06-20 would cause JVM crash. I am not sure if it has been fixed now.

#1126

@cxzl25 Thank you so much for the reply! I tried searching for it, but couldn’t find any information about a JVM crash caused on 2025-06-20. However, Iceberg-Rust is already using 2025-06-23. Should we give it a try?

https://github.com/apache/iceberg-rust/blob/main/rust-toolchain.toml

[richox]

i suggest to use a more recent nightly version (if it works)

[slfan1989]

i suggest to use a more recent nightly version (if it works)

Thanks for the suggestion! I’ll try a more recent nightly version.

[slfan1989]

@cxzl25 @richox Based on our testing, we can upgrade to a newer version. Would it be okay to use the 2025-12-15 release?

[Copilot]

Pull request overview

This PR upgrades the Rust nightly toolchain from nightly-2025-05-09 to nightly-2025-12-15 and applies automatic code refactorings enabled by newer Rust compiler features. The upgrade incorporates compiler improvements, bug fixes, and new language features including let-chains and improved standard library APIs.

Changes:

• Updated Rust nightly toolchain version in rust-toolchain.toml
• Refactored nested if-let statements to use let-chain syntax for improved readability
• Replaced manual clone operations with std::slice::from_ref for better performance
• Updated compiler intrinsics to use new const generic syntax for prefetch_read_data and prefetch_write_data
• Replaced manual bit rotation with rotate_left method
• Removed unused vec_into_raw_parts feature flag
• Applied clippy suggestions for removing unnecessary parentheses

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
rust-toolchain.toml	Updated toolchain version from nightly-2025-05-09 to nightly-2025-12-15
parquet_sink_exec.rs	Removed unnecessary parentheses in send call
orc_exec.rs	Refactored nested if-let statements to use let-chain syntax
generate_exec.rs	Replaced clone with std::slice::from_ref
debug_exec.rs	Replaced clone with std::slice::from_ref
execution_context.rs	Refactored nested if-let statements to use let-chain syntax
cached_exprs_evaluator.rs	Refactored nested if-let statements to use let-chain syntax
agg_exec.rs	Removed unnecessary parentheses and replaced modulo check with is_multiple_of
agg_table.rs	Refactored nested if-let statements to use let-chain syntax
acc.rs	Refactored nested if-let statements to use let-chain syntax
spark_strings.rs	Refactored nested if-let statements to use let-chain syntax
spark_get_json_object.rs	Refactored nested if-let statements to use let-chain syntax
spark_dates.rs	Improved formatting of multi-line expression
spark_hash.rs	Replaced clone with std::slice::from_ref in tests
lib.rs	Removed vec_into_raw_parts feature and updated prefetch intrinsics to use const generic syntax
ipc_compression.rs	Replaced clone with std::slice::from_ref in tests
batch_serde.rs	Replaced clone with std::slice::from_ref in tests
xxhash.rs	Replaced manual bit rotation with rotate_left method
spill.rs	Refactored nested if-let statements to use let-chain syntax

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The PR description states the upgrade is for "the past 45 days (2025-05-09 to 2025-12-15)", but the time span from May 9 to December 15, 2025 is approximately 220 days (about 7 months), not 45 days. Additionally, the linked issue #2001 mentions upgrading to "nightly-2025-06-23" (which would indeed be about 45 days from May 9), but the actual version being used here is "nightly-2025-12-15". Please verify which version is intended and correct the PR description accordingly.

[Copilot]

Pull request overview

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.