xiangmy21 commented on code in PR #17065:
URL: https://github.com/apache/iotdb/pull/17065#discussion_r2759067597
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iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/plan/node/process/ActiveRegionScanMergeNode.java:
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@@ -70,6 +70,9 @@ public PlanNode clone() {
@Override
public List<String> getOutputColumnNames() {
+ if (!children.isEmpty()) {
+ return children.get(0).getOutputColumnNames();
+ }
Review Comment:
The showDevicesColumnHeaders does not contains the 'Timeseries' type we need
for sort operation. It contains 'Device' instead of 'Timeseries'. Without this
modification the execution of `show timeseries root.sg4.** where time > 0 order
by timeseries` will raise error: org.apache.iotdb.jdbc.IoTDBSQLException: 301:
Cannot invoke "org.apache.tsfile.enums.TSDataType.ordinal()" because the return
value of "java.util.List.get(int)" is null
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