Better subset representation with BitSet

[yihozhang]

No description provided.

[codspeed-hq]

Merging this PR will degrade performance by 5.22%

❌ 1 regressed benchmark
✅ 45 untouched benchmarks
⏩ 190 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	WallTime	rust_rule_match_overhead[rule_run_1]	14 ms	14.8 ms	-5.22%

---

_{Comparing better-subset (7aeb1f6) with reuse-indices (8fb58d2)}

Footnotes

1. 190 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. ↩

[codecov-commenter]

Codecov Report

❌ Patch coverage is 48.58657% with 291 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.02%. Comparing base (9345f32) to head (7aeb1f6).
⚠️ Report is 3 commits behind head on reuse-indices.

Files with missing lines	Patch %	Lines
core-relations/src/offsets/mod.rs	15.43%	274 Missing ⚠️
core-relations/src/free_join/execute.rs	92.98%	16 Missing ⚠️
core-relations/src/free_join/frame_update.rs	83.33%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##           reuse-indices     #847      +/-   ##
=================================================
- Coverage          86.89%   86.02%   -0.87%     
=================================================
  Files                 85       85              
  Lines              24340    24750     +410     
=================================================
+ Hits               21151    21292     +141     
- Misses              3189     3458     +269     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.