Backport #29782 to 21.10: Fix concurrent access to LowCardinality during GROUP BY (leads to SIGSEGV)#29850
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KochetovNicolai merged 1 commit into21.10from Oct 12, 2021
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…ing GROUP BY (leads to SIGSEGV)
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Original pull-request #29782
Cherry-pick pull-request #29842
This pull-request is a last step of an automated backporting.
Treat it as a standard pull-request: look at the checks and resolve conflicts.
Merge it only if you intend to backport changes to the target branch, otherwise just close it.