v.20.1Bug Fix
Fix Error in GroupingAggregatedTransform with Mixed Aggregation Levels
Fix errorCannot clone block with columns because block has 0 columns ... While executing GroupingAggregatedTransform. It happened when settingdistributed_aggregation_memory_efficientwas enabled, and distributed query read aggregating data with different level from different shards (mixed single and two level aggregation). #10063 (Nikolai Kochetov).