hive 底層模塊實現-group by

準備數據 SELECT uid, SUM(COUNT) FROM logs GROUP BY uid; hive> SELECT * FROM logs; a 蘋果 5 a 橙子 3 a 蘋果 2 b 燒雞 1 hive> SELECT uid, SUM(COUNT) FROM logs GROUP BY uid; a 10 b 1 計算過程 默認設置了h

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