Backport #20110 to 21.2: MongoDB table engine now establishes connection only when it reads data.#20389
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alexey-milovidov merged 1 commit into21.2from Feb 12, 2021
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…ion only when it reads data.
robot-clickhouse
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pr-backport
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Original pull-request #20110
Cherry-pick pull-request #20384
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.