#13 feat: add PERF015 rule detecting implicit type conversion

[RAprogramm]

Closes #13

New schema-aware performance rule PERF015 (Warning): flags WHERE comparisons of a text column (CHAR/VARCHAR/TEXT) with a bare numeric literal — the engine casts the column side on every row, disabling its index.

• Registered with the schema-aware rule set (requires --schema)
• README, Cargo.toml description, docs updated to 33 rules; version bumped to 0.14.0
• 3 new tests: flagged bare number, quoted literal negative, numeric column negative

Local checks: fmt, clippy -D warnings, 475 tests, cargo qual (0 issues), mdbook build — all green.

[github-actions]

Rust Diff Analysis

Tip

PR size is within limits. Good job keeping changes focused!

Limits — configured thresholds for this repository

Each metric is compared against its configured maximum. If any limit is exceeded, the PR check fails.

Metric	Value	Limit	Status
Production Units	9	30	✅
Weighted Score	17	100	✅
Lines Added	105	200	✅

Understanding the metrics:

• Production Units: Functions, structs, enums, traits, and other semantic code units in production code
• Weighted Score: Complexity score based on unit types (public APIs weigh more than private)
• Lines Added: Raw count of new lines in production code

Summary — breakdown of changes by category

Production code counts toward limits. Test code is tracked but doesn't affect limits.

Metric	Production	Test
Functions	6	-
Structs/Enums	1	-
Other	2	-
Lines added	+105	+24
Lines removed	-1	-0
Total units	9	3

Production Changes — 9 units modified

Semantic units (functions, structs, etc.) that were added or modified in production code.

File	Unit	Type	Changes
src/rules.rs:244-277	RuleRunner::with_schema_and_config	function	+2 -1
src/rules/schema_aware.rs:226-233	ImplicitTypeConversion	struct	+11 -0
src/rules/schema_aware.rs:235-254	ImplicitTypeConversion	impl	+11 -0
src/rules/schema_aware.rs:236-240	ImplicitTypeConversion::new	function	+5 -0
src/rules/schema_aware.rs:242-253	ImplicitTypeConversion::text_columns	function	+12 -0
src/rules/schema_aware.rs:256-275	compares_column_to_number	function	+20 -0
src/rules/schema_aware.rs:277-320	Rule for ImplicitTypeConversion	impl	+3 -0
src/rules/schema_aware.rs:278-285	Rule for ImplicitTypeConversion::info	function	+8 -0
src/rules/schema_aware.rs:287-319	Rule for ImplicitTypeConversion::check	function	+33 -0

Test Changes — 3 units modified

Test code changes don't count toward PR size limits.

File	Unit	Type	Changes
tests/rules_tests.rs:500-508	test_implicit_conversion_flagged	function	+9 -0
tests/rules_tests.rs:510-518	test_quoted_literal_no_conversion	function	+9 -0
tests/rules_tests.rs:520-525	test_numeric_column_comparison_ok	function	+6 -0

Analysis Scope

Analyzed: 3 Rust files

Skipped files:

• 6 non-Rust files

Skipped file list:

• Cargo.lock (non-Rust)
• Cargo.toml (non-Rust)
• README.md (non-Rust)
• docs/src/introduction.md (non-Rust)
• docs/src/rules/index.md (non-Rust)
• docs/src/rules/performance.md (non-Rust)

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_{Rust Diff Analyzer}

[github-actions]

Cargo Quality Analysis

Tip

All quality checks passed. Code meets all standards!

Results — issues found by each analyzer

Each analyzer checks for specific code patterns. Zero issues means the check passed.

Analyzer	Issues	Status
path_import	0	✅
format_args	0	✅
empty_lines	0	✅
inline_comments	0	✅
mod_rs	0	✅
Total	0

Analyzers — what each check does

These analyzers enforce consistent code style and best practices.

Analyzer	Description	How to fix
path_import	Detects inline path imports like std::path::Path	Use use statements at the top
format_args	Detects format!("{}", x) patterns	Use format!("{x}") syntax
empty_lines	Detects empty lines inside function bodies	Remove extra blank lines
inline_comments	Detects // comment inside functions	Move to doc comments or remove
mod_rs	Detects mod.rs files (use modern module style)	Rename foo/mod.rs to foo.rs

Raw Output — detailed analysis log

Total issues: 0
Fixable: 0

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_{Cargo Quality}

[codecov]

Codecov Report

❌ Patch coverage is 96.05263% with 3 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/rules/schema_aware.rs	95.94%	3 Missing ⚠️

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