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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/07/03 07:38:55 UTC

[GitHub] [iotdb] SteveYurongSu commented on issue #3482: One NPE in UDTFDataSet.java

SteveYurongSu commented on issue #3482:
URL: https://github.com/apache/iotdb/issues/3482#issuecomment-873363486


   This is a correct discovery. An NPE can be triggered by executing a nested query in the CLI that is syntactically supported (but not supported on the user's documentation, the nested query is WIP). 
   
   example:
   select sin(sin(s1)) from root.sg1.d1
   
   Currently, we use `paths.get(i).getFullPath()` to get a reader index of a udtf plan, which may cause a NPE. After introducing nested query, we will use the column name to get the reader index, and all `paths` will be replaced by `columns` (we are doing the cleaning), at that time, there will be no NPEs.
   
   Thanks for the discovery!


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