feat: Support decimal for variance#18937

Draft

kumarUjjawal wants to merge 8 commits intoapache:mainfrom

kumarUjjawal:feat/decimal_agg

Commits on Nov 26, 2025

Commits on Nov 27, 2025

fixed incorrect tests and handled edge cases
kumarUjjawal
committed

Commits on Dec 10, 2025

Commits on Dec 12, 2025

Scale arithmetic now uses wider integers
kumarUjjawal
committed