[Bug] NPE when deleting timeseries via Java API

[bossenti]

Search before asking

• I searched in the issues and found nothing similar.

Version

1.3.0 (Java API)

Describe the bug and provide the minimal reproduce step

Deleting a time series via the Java API yields to a NullPointerExecption.

sessionPool.executeQueryStatement(DELETE timeseries root.*)

leads to:

java.lang.NullPointerException: Cannot invoke "java.util.List.size()" because "columnNameList" is null
at org.apache.iotdb.rpc.IoTDBRpcDataSet.<init>(IoTDBRpcDataSet.java:104)
at org.apache.iotdb.isession.SessionDataSet.<init>(SessionDataSet.java:121)
at org.apache.iotdb.session.SessionConnection.executeQueryStatement(SessionConnection.java:399)
at org.apache.iotdb.session.Session.executeStatementMayRedirect(Session.java:791)
at org.apache.iotdb.session.Session.executeQueryStatement(Session.java:763)

Nevertheless, the time series is deleted so the query is executed successfully but there seems to be an issue when creating the response object.

What did you expect to see?

Executing the query without an exception

What did you see instead?

The stack trace as shown above.

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!

[github-actions]

Hi, this is your first issue in IoTDB project. Thanks for your report. Welcome to join the community!

[HTHou]

Hi @bossenti , executeQueryStatement is for query statement only. You should use executeNonQueryStatement for delete statement.

[bossenti]

My bad 🙈 Please apologize, thank you for your help!