[GitHub] [iotdb] jixuan1989 commented on issue #6980: sessionDataSet.hasNext() 为false

[GitBox <gi...@apache.org>]

jixuan1989 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214310322

   It obeys expected that `getColumnNames()` has names.
   
   For example, the following sql has no data, but the resultset has column names.
   
   ```sql
   IoTDB> select * from root.** where time > 100;
   +----+--------------+--------------+
   |Time|root.sg1.d1.s1|root.sg1.d2.s1|
   +----+--------------+--------------+
   +----+--------------+--------------+
   Empty set.
   It costs 0.066s
   IoTDB> select * from root.** where time > 100 align by device;
   +----+------+--+
   |Time|Device|s1|
   +----+------+--+
   +----+------+--+
   Empty set.
   It costs 0.018s
   ```
   
   > 同一条sql，在时序数据库可以查询得出数据，但是 sessionDataSet.hasNext() 中的 hasCachedResults() 为false 
   
   it does matter that `HasCachedResults() == false`. Whether a client can get data just depends on `sessionDataSet.hasNext() == true`. 
   
   Even though it can not be stable reproduced, you may still paste the sqls  and code snippets to help us check whether it is a bug.
   


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