[BUG]: dont panic on count(distinct)

[universalmind303]

No description provided.

[codspeed-hq]

CodSpeed Performance Report

Merging #3481 will improve performances by 32.9%

_{Comparing universalmind303:count-distinct-no-panic (b09ff61) with main (75ad85a)}

Summary

⚡ 1 improvements
✅ 16 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	universalmind303:count-distinct-no-panic	Change
⚡	test_show[100 Small Files]	34.3 ms	25.8 ms	+32.9%

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 77.33%. Comparing base (75ad85a) to head (b09ff61).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/daft-sql/src/modules/aggs.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3481      +/-   ##
==========================================
- Coverage   77.43%   77.33%   -0.11%     
==========================================
  Files         696      696              
  Lines       84497    84616     +119     
==========================================
+ Hits        65429    65435       +6     
- Misses      19068    19181     +113     

Files with missing lines	Coverage Δ
src/daft-sql/src/modules/aggs.rs	72.83% <0.00%> (ø)

... and 6 files with indirect coverage changes

[raunakab]

LGTM!