Support prefix path 'root.**' in tree view scan

Author: shuwenwei

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/planner/TableOperatorGenerator.java

@@ -1028,7 +1028,10 @@ public static IDeviceID.TreeDeviceIdColumnValueExtractor createTreeDeviceIdColum
     try {
       PartialPath db = new PartialPath(treeDBName);
       int dbLevel = db.getNodes().length;
-      if (dbLevel == 2) {
+      // For the path of 'root.**', we can only get the root level in this place
+      // In this case, we still need to support deviceId such as 'root.db'
+      // The relevant deviceId must be two level db, but we can't get it now
+      if (dbLevel == 1 || dbLevel == 2) {
         return new TwoLevelDBExtractor(treeDBName.length());
       } else if (dbLevel == 3) {
         return new ThreeLevelDBExtractor(treeDBName.length());

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/TableLogicalPlanner.java

@@ -582,7 +582,10 @@ private void planTraverseDevice(final AbstractTraverseDevice statement, final An
           ClusterPartitionFetcher.getInstance().getSchemaPartition(tree));
 
       if (analysis.getSchemaPartitionInfo().getSchemaPartitionMap().size() > 1) {
-        throw new SemanticException("Tree device view with multiple databases is unsupported yet.");
+        throw new SemanticException(
+            "Tree device view with multiple databases("
+                + analysis.getSchemaPartitionInfo().getSchemaPartitionMap().keySet()
+                + ") is unsupported yet.");
       }
     } else {
       analysis.setSchemaPartitionInfo(

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/relational/planner/optimizations/PushPredicateIntoTableScan.java

@@ -580,7 +580,10 @@ private void getDeviceEntriesWithDataPartitions(
               attributeColumns,
               queryContext);
       if (deviceEntriesMap.size() > 1) {
-        throw new SemanticException("Tree device view with multiple databases is unsupported yet.");
+        throw new SemanticException(
+            "Tree device view with multiple databases("
+                + deviceEntriesMap.keySet()
+                + ") is unsupported yet.");
       }
       final String deviceDatabase =
           !deviceEntriesMap.isEmpty() ? deviceEntriesMap.keySet().iterator().next() : null;