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Update 2018.md

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Add link for changelog 2017
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Nikolai Kochetov 2020-03-23 18:30:06 +03:00 committed by GitHub
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docs/en/changelog/2018.md
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@ -1052,3 +1052,5 @@ This release contains bug fixes for the previous release 1.1.54337:
- When doing a rolling update on a cluster, at the point when some of the replicas are running the old version of ClickHouse and some are running the new version, replication is temporarily stopped and the message `unknown parameter 'shard'` appears in the log. Replication will continue after all replicas of the cluster are updated.
- If different versions of ClickHouse are running on the cluster servers, it is possible that distributed queries using the following functions will have incorrect results: `varSamp`, `varPop`, `stddevSamp`, `stddevPop`, `covarSamp`, `covarPop`, `corr`. You should update all cluster nodes.
## [Changelog for 2017](https://github.com/ClickHouse/ClickHouse/blob/master/docs/en/changelog/2017.md)