suyue created IOTDB-160:
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             Summary: External sort in non-sequential data
                 Key: IOTDB-160
                 URL: https://issues.apache.org/jira/browse/IOTDB-160
             Project: Apache IoTDB
          Issue Type: Improvement
            Reporter: suyue


For the query of non-sequential data, each chunk is constructed separately as 
reader,  then merged and sorted. When non-sequential data is large, so the 
number of chunks of merge is too large, it may cause the problem of exhausting 
memory. So when the number of chunks merged at the same time reaches a certain 
limit, the external method is adopted.



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