Fix arena data race in two level merge#21818
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CurtizJ merged 1 commit intoClickHouse:masterfrom Mar 18, 2021
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Backport #21818 to 21.3: Fix arena data race in two level merge
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Backport #21818 to 20.12: Fix arena data race in two level merge
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Backport #21818 to 21.1: Fix arena data race in two level merge
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Backport #21818 to 21.2: Fix arena data race in two level merge
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Backport #21818 to 20.8: Fix arena data race in two level merge
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fix possible crashes in aggregate functions with combinator Distinct, while using two-level aggregation. This is a follow-up fix of #18365 . Can only reproduced in production env. No test case available yet. cc @CurtizJ
Detailed description / Documentation draft:
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