Fix GroupingAggregatedTransform for single-level aggregation. Add test. #10063
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Fix error
Cannot clone block with columns because block has 0 columns ... While executing GroupingAggregatedTransform
. It happened when settingdistributed_aggregation_memory_efficient
was enabled, and distributed query read aggregating data with different level from different shards (mixed single and two level aggregation).Have decreased log level for
StorageDistributed
because otherwise test with cluster with default database fails.