Cheng Hao created SPARK-3056:
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             Summary: Sort-based Aggregation
                 Key: SPARK-3056
                 URL: https://issues.apache.org/jira/browse/SPARK-3056
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Cheng Hao


Currently, SparkSQL only support the hash-based aggregation, which may cause 
OOM if too many identical keys in the input tuples.



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