Backport #12035 to 20.4: Fix crash with low card column in merge join#13008
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Backport #12035 to 20.4: Fix crash with low card column in merge join#13008
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robot-clickhouse
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Original pull-request #12035
Cherry-pick pull-request #12845
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.