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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2021/01/14 14:00:54 UTC
[GitHub] [iotdb] SteveYurongSu opened a new pull request #2495: [DRAFT] Replace TreeSet with TimeSelector(heap-based) for better raw query performance
SteveYurongSu opened a new pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495
TBD.
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[GitHub] [iotdb] JackieTien97 merged pull request #2495: Replace TreeSet with TimeSelector (heap-based) for better raw query performance
Posted by GitBox <gi...@apache.org>.
JackieTien97 merged pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2495: Replace TreeSet with TimeSelector (heap-based) for better raw query performance
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495#issuecomment-763578218
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[GitHub] [iotdb] JackieTien97 commented on a change in pull request #2495: [DRAFT] Replace TreeSet with TimeSelector(heap-based) for better raw query performance
Posted by GitBox <gi...@apache.org>.
JackieTien97 commented on a change in pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495#discussion_r559366879
##########
File path: server/src/main/java/org/apache/iotdb/db/utils/datastructure/TimeSelector.java
##########
@@ -0,0 +1,155 @@
+/*
+ * 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.utils.datastructure;
+
+import java.util.Arrays;
+
+public class TimeSelector {
+
+ private static final int MIN_DEFAULT_CAPACITY = 8;
+
+ private final boolean ascending;
+
+ private long[] timeHeap;
+ private int heapSize;
+ private long lastTime;
+
+ public TimeSelector(int defaultCapacity, boolean isAscending) {
+ this.ascending = isAscending;
+ timeHeap = new long[Math.max(defaultCapacity, MIN_DEFAULT_CAPACITY)];
+ heapSize = 0;
+ lastTime = Long.MIN_VALUE;
+ }
+
+ public boolean isEmpty() {
+ while (heapSize != 0 && timeHeap[0] == lastTime) {
+ timeHeap[0] = timeHeap[heapSize - 1];
+ percolateDown(0, timeHeap[0]);
+ --heapSize;
Review comment:
The `--heapSize` statement should be moved before `percolateDown`.
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[GitHub] [iotdb] sonarcloud[bot] commented on pull request #2495: Replace TreeSet with TimeSelector (heap-based) for better raw query performance
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495#issuecomment-762892683
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[GitHub] [iotdb] JackieTien97 merged pull request #2495: Replace TreeSet with TimeSelector (heap-based) for better raw query performance
Posted by GitBox <gi...@apache.org>.
JackieTien97 merged pull request #2495:
URL: https://github.com/apache/iotdb/pull/2495
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