[To dev/1.3] Add the used memory calculation for DescPriorityMergeRea…

…der which is missed before (#14549)

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/DescPriorityMergeReader.java

@@ -19,15 +19,13 @@
 
 package org.apache.iotdb.db.storageengine.dataregion.read.reader.common;
 
-import org.apache.tsfile.read.reader.IPointReader;
-
-import java.io.IOException;
 import java.util.PriorityQueue;
 
 public class DescPriorityMergeReader extends PriorityMergeReader {
 
   public DescPriorityMergeReader() {
-    super.heap =
+    currentReadStopTime = Long.MAX_VALUE;
+    heap =
         new PriorityQueue<>(
             (o1, o2) -> {
               int timeCompare =
@@ -37,13 +35,7 @@ public DescPriorityMergeReader() {
   }
 
   @Override
-  public void addReader(IPointReader reader, MergeReaderPriority priority, long endTime)
-      throws IOException {
-    if (reader.hasNextTimeValuePair()) {
-      heap.add(new Element(reader, reader.nextTimeValuePair(), priority));
-      super.currentReadStopTime = Math.min(currentReadStopTime, endTime);
-    } else {
-      reader.close();
-    }
+  protected void updateCurrentReadStopTime(long endTime) {
+    currentReadStopTime = Math.min(currentReadStopTime, endTime);
   }
 }

iotdb-core/datanode/src/main/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/PriorityMergeReader.java

@@ -19,7 +19,6 @@
 
 package org.apache.iotdb.db.storageengine.dataregion.read.reader.common;
 
-import org.apache.iotdb.commons.utils.TestOnly;
 import org.apache.iotdb.db.queryengine.plan.planner.memory.MemoryReservationManager;
 
 import org.apache.tsfile.read.TimeValuePair;
@@ -34,7 +33,7 @@ public class PriorityMergeReader implements IPointReader {
 
   // max time of all added readers in PriorityMergeReader
   // or min time of all added readers in DescPriorityMergeReader
-  protected long currentReadStopTime;
+  protected long currentReadStopTime = Long.MIN_VALUE;
 
   protected PriorityQueue<Element> heap;
 
@@ -57,25 +56,12 @@ public void setMemoryReservationManager(MemoryReservationManager memoryReservati
     this.memoryReservationManager = memoryReservationManager;
   }
 
-  @TestOnly
-  public void addReader(IPointReader reader, long priority) throws IOException {
-    if (reader.hasNextTimeValuePair()) {
-      heap.add(
-          new Element(
-              reader,
-              reader.nextTimeValuePair(),
-              new MergeReaderPriority(Long.MAX_VALUE, priority, 0, false)));
-    } else {
-      reader.close();
-    }
-  }
-
   public void addReader(IPointReader reader, MergeReaderPriority priority, long endTime)
       throws IOException {
     if (reader.hasNextTimeValuePair()) {
       Element element = new Element(reader, reader.nextTimeValuePair(), priority);
       heap.add(element);
-      currentReadStopTime = Math.max(currentReadStopTime, endTime);
+      updateCurrentReadStopTime(endTime);
       long size = element.getReader().getUsedMemorySize();
       usedMemorySize += size;
       if (memoryReservationManager != null) {
@@ -86,6 +72,10 @@ public void addReader(IPointReader reader, MergeReaderPriority priority, long en
     }
   }
 
+  protected void updateCurrentReadStopTime(long endTime) {
+    currentReadStopTime = Math.max(currentReadStopTime, endTime);
+  }
+
   public long getCurrentReadStopTime() {
     return currentReadStopTime;
   }

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/FakedSeriesReader.java → iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/AscFakedSeriesReader.java

@@ -25,31 +25,31 @@
 
 import java.io.IOException;
 
-public class FakedSeriesReader implements IPointReader {
+public class AscFakedSeriesReader implements IPointReader {
 
-  private int index;
-  private int size;
-  private boolean initWithTimeList;
-  private static final TSDataType DATA_TYPE = TSDataType.INT64;
+  protected int index;
+  protected int size;
+  protected boolean initWithTimeList;
+  protected static final TSDataType DATA_TYPE = TSDataType.INT64;
 
   // init with time list and value
-  private long[] timestamps;
-  private long value;
+  protected long[] timestamps;
+  protected long value;
 
   // init with startTime, size, interval and modValue
-  private long startTime;
-  private int interval;
-  private int modValue;
+  protected long startTime;
+  protected int interval;
+  protected int modValue;
 
-  public FakedSeriesReader(long[] timestamps, long value) {
+  public AscFakedSeriesReader(long[] timestamps, long value) {
     this.initWithTimeList = true;
     this.index = 0;
     this.size = timestamps.length;
     this.timestamps = timestamps;
     this.value = value;
   }
 
-  public FakedSeriesReader(long startTime, int size, int interval, int modValue) {
+  public AscFakedSeriesReader(long startTime, int size, int interval, int modValue) {
     this.initWithTimeList = false;
     this.index = 0;
     this.size = size;
@@ -82,8 +82,8 @@ public TimeValuePair currentTimeValuePair() throws IOException {
 
   @Override
   public long getUsedMemorySize() {
-    // not used
-    return 0;
+    // use size of timestamps to mock the used memory
+    return size;
   }
 
   @Override

iotdb-core/datanode/src/test/java/org/apache/iotdb/db/storageengine/dataregion/read/reader/common/DescFakedSeriesReader.java

@@ -0,0 +1,54 @@
+/*
+ * 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.storageengine.dataregion.read.reader.common;
+
+import org.apache.tsfile.enums.TSDataType;
+import org.apache.tsfile.read.TimeValuePair;
+import org.apache.tsfile.utils.TsPrimitiveType;
+
+public class DescFakedSeriesReader extends AscFakedSeriesReader {
+
+  public DescFakedSeriesReader(long[] timestamps, long value) {
+    super(timestamps, value);
+    index = size - 1;
+  }
+
+  public DescFakedSeriesReader(long startTime, int size, int interval, int modValue) {
+    super(startTime, size, interval, modValue);
+    index = size - 1;
+    startTime = startTime + interval * size;
+  }
+
+  @Override
+  public boolean hasNextTimeValuePair() {
+    return index >= 0;
+  }
+
+  @Override
+  public TimeValuePair nextTimeValuePair() {
+    if (initWithTimeList) {
+      return new TimeValuePair(timestamps[index--], TsPrimitiveType.getByType(DATA_TYPE, value));
+    } else {
+      long time = startTime;
+      startTime -= interval;
+      index--;
+      return new TimeValuePair(time, TsPrimitiveType.getByType(TSDataType.INT64, time % modValue));
+    }
+  }
+}