v.25.10Bug Fix (user-visible misbehavior in an official stable release)

Fix propagation of is_shared flag

Official CH changelog text
Fixed propagation of is_shared flag in ColumnLowCardinality. It may lead to a wrong group-by result if a new value is inserted in a column after hash values are already pre-calculated and cached in the ReverseIndex. #88213 (Nikita Taranov).
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