Refactor some method and PlanNodeType (#17918)

Author: Wei-hao-Li

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

@@ -343,17 +343,7 @@ private RelationPlan processPhysicalTable(Table table, Scope scope) {
     final ImmutableList.Builder<Symbol> outputSymbolsBuilder = ImmutableList.builder();
     final ImmutableMap.Builder<Symbol, ColumnSchema> symbolToColumnSchema = ImmutableMap.builder();
     final Collection<Field> fields = scope.getRelationType().getAllFields();
-    final QualifiedName qualifiedName = analysis.getRelationName(table);
-
-    if (!qualifiedName.getPrefix().isPresent()) {
-      throw new IllegalStateException(
-          DataNodeQueryMessages.TABLE + table.getName() + " has no prefix!");
-    }
-
-    final QualifiedObjectName qualifiedObjectName =
-        new QualifiedObjectName(
-            qualifiedName.getPrefix().map(QualifiedName::toString).orElse(null),
-            qualifiedName.getSuffix());
+    final QualifiedObjectName qualifiedObjectName = getQualifiedObjectName(table, analysis);
 
     // on the basis of that the order of fields is same with the column category order of segments
     // in DeviceEntry
@@ -411,6 +401,19 @@ private RelationPlan processPhysicalTable(Table table, Scope scope) {
     return new RelationPlan(tableScanNode, scope, outputSymbols, outerContext);
   }
 
+  public static QualifiedObjectName getQualifiedObjectName(Table table, Analysis analysis) {
+    final QualifiedName qualifiedName = analysis.getRelationName(table);
+    if (!qualifiedName.getPrefix().isPresent()) {
+      throw new IllegalStateException("Table " + table.getName() + " has no prefix!");
+    }
+
+    final QualifiedObjectName qualifiedObjectName =
+        new QualifiedObjectName(
+            qualifiedName.getPrefix().map(QualifiedName::toString).orElse(null),
+            qualifiedName.getSuffix());
+    return qualifiedObjectName;
+  }
+
   @Override
   public RelationPlan visitQuerySpecification(final QuerySpecification node, final Void context) {
     return new QueryPlanner(

iotdb-core/node-commons/src/main/java/org/apache/iotdb/commons/queryengine/plan/planner/plan/node/PlanNodeType.java

@@ -201,6 +201,8 @@ public enum PlanNodeType {
   ALIGNED_AGGREGATION_TREE_DEVICE_VIEW_SCAN_NODE((short) 1041),
   NON_ALIGNED_AGGREGATION_TREE_DEVICE_VIEW_SCAN_NODE((short) 1042),
   TABLE_NEXT_FILL_NODE((short) 1043),
+  SESSION_SCAN_NODE((short) 1044),
+  EVENT_SCAN_NODE((short) 1045),
 
   RELATIONAL_INSERT_TABLET((short) 2000),
   RELATIONAL_INSERT_ROW((short) 2001),