[BUG]: Sql groupby fix

[universalmind303]

addresses #2835

[codspeed-hq]

CodSpeed Performance Report

Merging #2843 will degrade performances by 69.77%

_{Comparing universalmind303:sql-groupby-fix (596cfab) with main (6594d87)}

Summary

⚡ 1 improvements
❌ 1 regressions
✅ 14 untouched benchmarks

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

Benchmarks breakdown

	Benchmark	main	universalmind303:sql-groupby-fix	Change
⚡	test_count[1 Small File]	22.8 ms	11.2 ms	×2
❌	test_show[100 Small Files]	49.6 ms	164.2 ms	-69.77%

[kevinzwang]

LGTM!

One thing I'm wondering is what the behavior should be when grouping by something that is not just a column, such as SELECT * FROM table GROUP BY a + b. Right now it errors but the error messages come from the logical plan builder and do not really make sense in the context of the SQL query itself. Perhaps we just disallow it explicitly.