v.21.7Bug Fix
Fix segfault in clickhouse-copier when sharding_key is absent in task config
A fix for clickhouse-copier tool: Fix segfault when sharding_key is absent in task config for copier. #25419 (Nikita Mikhaylov).A fix for clickhouse-copier tool: Fix segfault when sharding_key is absent in task config for copier. #25419 (Nikita Mikhaylov).