mysql> EXPLAIN ANALYZE VERBOSE select count(*),`serviceName` from tracing_normal group by `serviceName` order by 1 desc limit 10; 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| stage | node | plan | 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| 0 | 0 | MergeScanExec: peers=[4582730104832(1067, 0), ], metrics={"partition_0":{"regions":1,"total_poll_duration":"7.107162732s","total_do_get_cost":"4.235373ms","region_metrics":[{"region_id":"4582730104832(1067, 0)","poll_duration":"7.107162732s","do_get_cost":"4.235373ms","total_cost":"7.11714215s"}]}} metrics=[output_rows: 10, greptime_exec_read_cost: 0, finish_time: 7117246627, first_consume_time: 7111410245, ready_time: 4246314, ] | | 1 | 0 | SortPreservingMergeExec: [count(*)@0 DESC], fetch=10 metrics=[output_rows: 10, elapsed_compute: 7010, ] SortExec: TopK(fetch=10), expr=[count(*)@0 DESC], preserve_partitioning=[true] metrics=[output_rows: 320, elapsed_compute: 534287, row_replacements: 834, ] ProjectionExec: expr=[count(*)@1 as count(*), serviceName@0 as serviceName] metrics=[output_rows: 2019, elapsed_compute: 26229, ] AggregateExec: mode=FinalPartitioned, gby=[serviceName@0 as serviceName], aggr=[count(*)] metrics=[output_rows: 2019, elapsed_compute: 2242303, spill_count: 0, spilled_bytes: 0, spilled_rows: 0, peak_mem_used: 1098048, ] CoalesceBatchesExec: target_batch_size=8192 metrics=[output_rows: 37189, elapsed_compute: 18740169, ] RepartitionExec: partitioning=Hash([serviceName@0], 32), input_partitions=32 metrics=[fetch_time: 34054309553, repartition_time: 5691051, send_time: 1466157, ] AggregateExec: mode=Partial, gby=[serviceName@0 as serviceName], aggr=[count(*)] metrics=[output_rows: 37189, elapsed_compute: 9820824908, spill_count: 0, spilled_bytes: 0, spilled_rows: 0, skipped_aggregation_rows: 0, peak_mem_used: 22557680, ] UnorderedScan: region=4582730104832(1067, 0), {"partition_count":{"count":3910, "mem_ranges":4, "files":62, "file_ranges":3906}, "projection": ["serviceName", "ts"], "files": [{"file_id":"4582730104832(1067, 0)/575f9157-35d8-4282-8a1c-0cf2a66f0142","time_range_start":"0::Millisecond","time_range_end":"0::Millisecond","rows":10472,"size":23232,"index_size":2577}, {"file_id":"4582730104832(1067, 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"stream_eof":true}}]} metrics=[output_rows: 405595342, mem_used: 236325088408, build_parts_cost: 293577336, build_reader_cost: 3628853180, convert_cost: 1701715261, elapsed_await: 23661792207, elapsed_poll: 20887348646, scan_cost: 21732985579, yield_cost: 12240959834, ] | | NULL | NULL | Total rows: 10 | 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3 rows in set (7.12 sec) mysql> notee;