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new 95a7407e0 [core] Add test for histogram metric (#1618)
95a7407e0 is described below
commit 95a7407e0776ccd74a9357c9d7d57606d6053508
Author: GuojunLi <[email protected]>
AuthorDate: Tue Jul 25 16:01:00 2023 +0800
[core] Add test for histogram metric (#1618)
This closes #1618.
---
.../DescriptiveStatisticsHistogramTest.java | 119 +++++++++++++++++++++
1 file changed, 119 insertions(+)
diff --git
a/paimon-core/src/test/java/org/apache/paimon/metrics/DescriptiveStatisticsHistogramTest.java
b/paimon-core/src/test/java/org/apache/paimon/metrics/DescriptiveStatisticsHistogramTest.java
new file mode 100644
index 000000000..341e9f988
--- /dev/null
+++
b/paimon-core/src/test/java/org/apache/paimon/metrics/DescriptiveStatisticsHistogramTest.java
@@ -0,0 +1,119 @@
+/*
+ * 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.paimon.metrics;
+
+import org.apache.paimon.utils.InstantiationUtil;
+
+import org.assertj.core.data.Offset;
+import org.junit.jupiter.api.Test;
+import org.testcontainers.utility.ThrowingFunction;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.offset;
+
+/**
+ * Tests for {@link DescriptiveStatisticsHistogram} and {@link
+ * DescriptiveStatisticsHistogramStatistics}.
+ */
+class DescriptiveStatisticsHistogramTest {
+
+ private static final double[] DATA = {1, 2, 3, 4, 5, 6, 7, 8, 9};
+
+ @Test
+ void testDescriptiveHistogram() {
+ int size = 10;
+ testHistogram(size, new DescriptiveStatisticsHistogram(size));
+ }
+
+ @Test
+ void testSerialization() throws Exception {
+ testDuplication(
+ original -> {
+ final byte[] bytes =
InstantiationUtil.serializeObject(original);
+ return InstantiationUtil.deserializeObject(bytes,
getClass().getClassLoader());
+ });
+ }
+
+ @Test
+ void testCopy() throws Exception {
+
testDuplication(DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot::copy);
+ }
+
+ private void testHistogram(int size, Histogram histogram) {
+ HistogramStatistics statistics;
+
+ for (int i = 0; i < size; i++) {
+ histogram.update(i);
+
+ statistics = histogram.getStatistics();
+ assertThat(histogram.getCount()).isEqualTo(i + 1);
+ assertThat(statistics.size()).isEqualTo(histogram.getCount());
+ assertThat(statistics.getMax()).isEqualTo(i);
+ assertThat(statistics.getMin()).isEqualTo(0);
+ }
+
+ statistics = histogram.getStatistics();
+ assertThat(statistics.size()).isEqualTo(size);
+ assertThat(statistics.getQuantile(0.5)).isCloseTo((size - 1) / 2.0,
offset(0.001));
+
+ for (int i = size; i < 2 * size; i++) {
+ histogram.update(i);
+
+ statistics = histogram.getStatistics();
+ assertThat(histogram.getCount()).isEqualTo(i + 1);
+ assertThat(statistics.size()).isEqualTo(size);
+ assertThat(statistics.getMax()).isEqualTo(i);
+ assertThat(statistics.getMin()).isEqualTo(i + 1 - size);
+ }
+
+ statistics = histogram.getStatistics();
+ assertThat(statistics.size()).isEqualTo(size);
+ assertThat(statistics.getQuantile(0.5)).isCloseTo(size + (size - 1) /
2.0, offset(0.001));
+ }
+
+ private static void testDuplication(
+ ThrowingFunction<
+
DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot,
+
DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot>
+ duplicator)
+ throws Exception {
+
+ DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot
original =
+ new
DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot();
+ original.evaluate(DATA);
+
+ assertOperations(original);
+
+ final DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot
copy =
+ duplicator.apply(original);
+
+ assertOperations(copy);
+ }
+
+ private static void assertOperations(
+ DescriptiveStatisticsHistogramStatistics.CommonMetricsSnapshot
statistics) {
+ assertThat(statistics.getPercentile(0.5)).isEqualTo(1);
+ assertThat(statistics.getCount()).isEqualTo(9);
+ assertThat(statistics.getMin()).isEqualTo(1);
+ assertThat(statistics.getMax()).isEqualTo(9);
+ assertThat(statistics.getMean()).isEqualTo(5);
+ assertThat(statistics.getStandardDeviation()).isCloseTo(2.7,
Offset.offset(0.5));
+ assertThat(statistics.getValues()).containsExactly(DATA);
+ }
+}
