Fix skip_unavailable_shards in case of unavailable hosts #48771
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In ClickHouse#26658 only one excessive connect had been removed, but due to RemoteQueryExecutor will execute query again in read(), there is one more, fix this by correctly mark connection in sendQuery() But note, that there still will be excessive connections due to separate connections for obtaining structure. Follow-up for: ClickHouse#26658 Fixes: ClickHouse#48728 Signed-off-by: Azat Khuzhin <a.khuzhin@semrush.com>
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Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Fix skip_unavailable_shards in case of unavailable hosts
In #26658 only one excessive connect had been removed, but due to RemoteQueryExecutor will execute query again in read(), there is one more, fix this by correctly mark connection in sendQuery()
But note, that there still will be excessive connections due to separate connections for obtaining structure.
Follow-up for: #26658
Fixes: #48728 (cc @SaltTan @den-crane )