chore: update Rust to 1.97.1

[tensordreams]

Overview

Bumps the pinned toolchain in rust-toolchain.toml from 1.92.0 to 1.97.1 and fixes everything the new Clippy complains about, so make pedantic is green again.

Changes

The bulk of the diff is the new lint against redundant references in formatting macro arguments. format!, panic! and assert_eq! already take their arguments by reference, so the explicit & was pointless. Purely mechanical, no behaviour change.

The rest, one by one:

• sql_schema_differ.rs — Some(TableChange::…).filter(|_| differ.primary_key_changed()) becomes differ.primary_key_changed().then_some(TableChange::…). The lint warns that this reorders the condition against the value; harmless here, since the value is a unit variant and the predicate is a pure query.
• native_types.rs, flavour/postgres.rs — a.and_then(|a| b.map(|b| (a, b))) becomes a.zip(b).
• datasource_loader.rs — sort_by(|(a, _), (b, _)| a.cmp(b)) becomes sort_by_key.
• validations/fields.rs — the DecimalType capability check moves from an if inside the match arm into a match guard.
• quaint/src/ast/values.rs, query_document/selection.rs — two blocks that returned None on the miss now use ?.
• configuration.rs, statistics.rs, differ_database.rs — iter().map(|(_, v)| …) over maps becomes values().
• visitor/mssql.rs — drop a no-op into_iter() on an argument that already accepts IntoIterator.

Inlined format arguments

Since the redundant-reference fix was already rewriting those formatting macro calls, the second commit captures their arguments in the format string as well — panic!("Unknown driver adapter: {}", s) becomes panic!("Unknown driver adapter: {s}").

This is scoped to the lines this PR already touches. Every argument that can be captured is, including in calls that also carry arguments that cannot be, so a few strings mix the two styles:

format!("{alter_column_prefix} SET DATA TYPE {}", render_column_type(columns.next, renderer))

What stays positional is only what the language cannot capture: method calls (field.name()) and field accesses (self.schema).

Note that clippy::uninlined_format_args only fires when all of a call's arguments are capturable, so the mixed cases above are beyond what the lint would ask for. With this PR applied, no fully-capturable call remains on any line it touches.

Verification

• make pedantic passes (both the native and the wasm32-unknown-unknown Clippy passes).
• make test-unit passes: 112 test binaries, no failures.

[coderabbitai]

Walkthrough

The PR updates Rust code across query, schema, connector, validation, and test components. Changes replace explicit formatting borrows, simplify iterator and Option handling with zip, values, sort_by_key, and then_some, use a guarded match for decimal capability validation, simplify row flattening and filter accumulation, and update generated SQL or error-message formatting. The Rust toolchain channel changes from 1.92.0 to 1.97.1.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 42.62% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title correctly summarizes the main change: bumping the Rust toolchain to 1.97.1.
Description check	✅ Passed	The description is clearly related to the diff, covering the toolchain bump and the Clippy-driven cleanup changes.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/rust-1.97

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch chore/rust-1.97

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[codspeed-hq]

Merging this PR will not alter performance

✅ 11 untouched benchmarks
⏩ 11 skipped benchmarks¹

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_{Comparing chore/rust-1.97 (7b506ab) with main (9d90ce2)}

Footnotes

1. 11 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

Wasm Query Compiler File Size

Engine	This PR	Base branch	Diff
Postgres	3.279MiB	3.509MiB	-236.016KiB
Postgres (gzip)	1.089MiB	1.143MiB	-55.894KiB
Postgres (size-optimized)	1.655MiB	1.768MiB	-116.021KiB
Postgres (size-optimized, gzip)	661.978KiB	695.966KiB	-33.989KiB
Mysql	3.235MiB	3.462MiB	-231.869KiB
Mysql (gzip)	1.071MiB	1.128MiB	-58.667KiB
Mysql (size-optimized)	1.625MiB	1.738MiB	-115.920KiB
Mysql (size-optimized, gzip)	652.276KiB	684.445KiB	-32.169KiB
Sqlite	3.152MiB	3.380MiB	-233.057KiB
Sqlite (gzip)	1.041MiB	1.099MiB	-59.878KiB
Sqlite (size-optimized)	1.585MiB	1.694MiB	-111.705KiB
Sqlite (size-optimized, gzip)	635.223KiB	667.611KiB	-32.388KiB
SQL Server	3.362MiB	3.597MiB	-240.191KiB
SQL Server (gzip)	1.097MiB	1.161MiB	-65.372KiB
SQL Server (size-optimized)	1.652MiB	1.767MiB	-117.578KiB
SQL Server (size-optimized, gzip)	664.799KiB	698.851KiB	-34.052KiB
CockroachDB	3.324MiB	3.559MiB	-241.258KiB
CockroachDB (gzip)	1.106MiB	1.162MiB	-57.907KiB
CockroachDB (size-optimized)	1.676MiB	1.793MiB	-119.644KiB
CockroachDB (size-optimized, gzip)	672.061KiB	705.976KiB	-33.916KiB