Alima777 commented on a change in pull request #796: [IoTDB-468] Restructure 
QueryPlan
URL: https://github.com/apache/incubator-iotdb/pull/796#discussion_r378145507
 
 

 ##########
 File path: 
server/src/main/java/org/apache/iotdb/db/qp/physical/crud/AlignByDevicePlan.java
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 @@ -0,0 +1,181 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.iotdb.db.qp.physical.crud;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import org.apache.iotdb.db.qp.logical.Operator;
+import org.apache.iotdb.db.qp.logical.Operator.OperatorType;
+import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
+import org.apache.iotdb.tsfile.read.expression.IExpression;
+
+public class AlignByDevicePlan extends QueryPlan {
+
+  private List<String> measurements; // for group by device sql, e.g. 
temperature
+  private Map<String, Set<String>> deviceToMeasurementsMap; // for group by 
device sql, e.g. root.ln.d1 -> temperature
+  private Map<String, TSDataType> dataTypeConsistencyChecker; // for group by 
device sql, e.g. root.ln.d1.temperature -> Float
+  private Map<String, IExpression> deviceToFilterMap; // for group by device 
sql
+
+  private GroupByPlan groupByPlan;
+  private FillQueryPlan fillQueryPlan;
+  private AggregationPlan aggregationPlan;
 
 Review comment:
   Of course there isn't a RawDataQueryPan. We don't need parameters in it.

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