v.20.5Bug Fix

Disable Default GROUP BY Sharding Key Optimization and Fix WITH ROLLUP/CUBE/TOTALS

Official CH changelog text
Disable GROUP BY sharding_key optimization by default (optimize_distributed_group_by_sharding_key had been introduced and turned of by default, due to trickery of sharding_key analyzing, simple example is if in sharding key) and fix it for WITH ROLLUP/CUBE/TOTALS. #10516 (Azat Khuzhin).
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