[GitHub] [iotdb] jixuan1989 commented on a change in pull request #2468: [ISSUE-2484] Fix creating timeseries error by using "create" or "insert" statement

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

jixuan1989 commented on a change in pull request #2468:
URL: https://github.com/apache/iotdb/pull/2468#discussion_r579744172



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File path: server/src/main/java/org/apache/iotdb/db/metadata/MTree.java
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@@ -242,23 +242,33 @@ MeasurementMNode createTimeseries(
     // synchronize check and add, we need addChild and add Alias become atomic operation
     // only write on mtree will be synchronized
     synchronized (this) {
-      if (cur.hasChild(leafName)) {
+      MNode child = cur.getChild(leafName);
+      if (child instanceof MeasurementMNode || child instanceof StorageGroupMNode) {
         throw new PathAlreadyExistException(path.getFullPath());
       }
-      if (alias != null && cur.hasChild(alias)) {
-        throw new AliasAlreadyExistException(path.getFullPath(), alias);
+
+      if (alias != null) {
+        MNode childByAlias = cur.getChild(alias);
+        if (childByAlias instanceof MeasurementMNode) {

Review comment:
       how to guarantee childByAlias != null




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