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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2022/08/12 08:22:50 UTC
[GitHub] [iotdb] szz-9503 opened a new issue, #6980: sessionDataSet.hasNext() 为false
szz-9503 opened a new issue, #6980:
URL: https://github.com/apache/iotdb/issues/6980
**Describe the bug**
同一条sql，在时序数据库可以查询得出数据，但是我在java 中使用 session.executeQueryStatement(sql) 方法，获取到的SessionDataSet，sessionDataSet.getColumnNames() 是有数据的，但是 sessionDataSet.hasNext() 中的 hasCachedResults() 为false , （这个现象不是经常出现）
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[GitHub] [iotdb] szz-9503 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
szz-9503 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214531550
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[GitHub] [iotdb] szz-9503 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
szz-9503 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214529837
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[GitHub] [iotdb] szz-9503 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
szz-9503 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214547465
我让数据采集跑了2天，发现之前那个问题不见了，我会继续观察这个问题，如果再次发生，我会将SQL贴入到这个帖子里面的，麻烦你们了
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[GitHub] [iotdb] jixuan1989 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by 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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[GitHub] [iotdb] szz-9503 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
szz-9503 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214532837
我使用的是session 中提供的example，在使用过程中会遇见数据库有数据，但是就如你所说的sessionDataSet.hasNext()==false 的情况
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[GitHub] [iotdb] jixuan1989 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
jixuan1989 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1214534328
可以打印一下代码里的SQL吗。
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[GitHub] [iotdb] szz-9503 commented on issue #6980: sessionDataSet.hasNext() 为false
Posted by GitBox <gi...@apache.org>.
szz-9503 commented on issue #6980:
URL: https://github.com/apache/iotdb/issues/6980#issuecomment-1212858330
导致我获取不到 时序数据的值
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