[GitHub] [incubator-doris] morningman commented on a change in pull request #3320: (#3319) support java version hyperloglog

[GitBox <gi...@apache.org>]

morningman commented on a change in pull request #3320:
URL: https://github.com/apache/incubator-doris/pull/3320#discussion_r441548250



##########
File path: fe/src/test/java/org/apache/doris/load/loadv2/HllTest.java
##########
@@ -0,0 +1,268 @@
+// 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.doris.load.loadv2;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.DataInputStream;
+import java.io.DataOutput;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+import static org.apache.doris.load.loadv2.Hll.*;
+
+public class HllTest {
+
+    @Test
+    public void testFindFirstNonZeroBitPosition() {
+        Assert.assertTrue(getLongTailZeroNum(0) == 0);
+        Assert.assertTrue(getLongTailZeroNum(1) == 0);
+        Assert.assertTrue(getLongTailZeroNum(1l << 30) == 30);
+        Assert.assertTrue(getLongTailZeroNum(1l << 62) == 62);
+    }
+
+    @Test
+    public void HllBasicTest() throws IOException {
+        // test empty
+        Hll emptyHll = new Hll();
+
+        Assert.assertTrue(emptyHll.getType() == HLL_DATA_EMPTY);
+        Assert.assertTrue(emptyHll.estimateCardinality() == 0);
+
+        ByteArrayOutputStream emptyOutputStream = new ByteArrayOutputStream();
+        DataOutput output = new DataOutputStream(emptyOutputStream);
+        emptyHll.serialize(output);
+        DataInputStream emptyInputStream = new DataInputStream(new ByteArrayInputStream(emptyOutputStream.toByteArray()));
+        Hll deserializedEmptyHll = new Hll();
+        deserializedEmptyHll.deserialize(emptyInputStream);
+        Assert.assertTrue(deserializedEmptyHll.getType() == HLL_DATA_EMPTY);
+
+        // test explicit
+        Hll explicitHll = new Hll();
+        for (int i = 0; i < HLL_EXPLICLIT_INT64_NUM; i++) {
+            explicitHll.updateWithHash(i);
+        }
+        Assert.assertTrue(explicitHll.getType() == HLL_DATA_EXPLICIT);
+        Assert.assertTrue(explicitHll.estimateCardinality() == HLL_EXPLICLIT_INT64_NUM);
+
+        ByteArrayOutputStream explicitOutputStream = new ByteArrayOutputStream();
+        DataOutput explicitOutput = new DataOutputStream(explicitOutputStream);
+        explicitHll.serialize(explicitOutput);
+        DataInputStream explicitInputStream = new DataInputStream(new ByteArrayInputStream(explicitOutputStream.toByteArray()));
+        Hll deserializedExplicitHll = new Hll();
+        deserializedExplicitHll.deserialize(explicitInputStream);
+        Assert.assertTrue(deserializedExplicitHll.getType() == HLL_DATA_EXPLICIT);
+
+        // test sparse
+        Hll sparseHll = new Hll();
+        for (int i = 0; i < HLL_SPARSE_THRESHOLD; i++) {
+            sparseHll.updateWithHash(i);
+        }
+        Assert.assertTrue(sparseHll.getType() == HLL_DATA_FULL);
+        // 2% error rate
+        Assert.assertTrue(sparseHll.estimateCardinality() > HLL_SPARSE_THRESHOLD * (1 - 0.02) &&
+                sparseHll.estimateCardinality() < HLL_SPARSE_THRESHOLD * (1 + 0.02));
+
+        ByteArrayOutputStream sparseOutputStream = new ByteArrayOutputStream();
+        DataOutput sparseOutput = new DataOutputStream(sparseOutputStream);
+        sparseHll.serialize(sparseOutput);
+        DataInputStream sparseInputStream = new DataInputStream(new ByteArrayInputStream(sparseOutputStream.toByteArray()));
+        Hll deserializedSparseHll = new Hll();
+        deserializedSparseHll.deserialize(sparseInputStream);
+        Assert.assertTrue(deserializedSparseHll.getType() == HLL_DATA_SPARSE);
+        Assert.assertTrue(sparseHll.estimateCardinality() == deserializedSparseHll.estimateCardinality());
+
+
+        // test full
+        Hll fullHll = new Hll();
+        for (int i = 1; i <= Short.MAX_VALUE; i++) {
+            fullHll.updateWithHash(i);
+        }
+        Assert.assertTrue(fullHll.getType() == HLL_DATA_FULL);
+        // the result 32748 is consistent with C++ 's implementation
+        Assert.assertTrue(fullHll.estimateCardinality() == 32748);
+        Assert.assertTrue(fullHll.estimateCardinality() > Short.MAX_VALUE * (1 - 0.02) &&
+                fullHll.estimateCardinality() < Short.MAX_VALUE * (1 + 0.02));
+
+        ByteArrayOutputStream fullHllOutputStream = new ByteArrayOutputStream();
+        DataOutput fullHllOutput = new DataOutputStream(fullHllOutputStream);
+        fullHll.serialize(fullHllOutput);
+        DataInputStream fullHllInputStream = new DataInputStream(new ByteArrayInputStream(fullHllOutputStream.toByteArray()));
+        Hll deserializedFullHll = new Hll();
+        deserializedFullHll.deserialize(fullHllInputStream);
+        Assert.assertTrue(deserializedFullHll.getType() == HLL_DATA_FULL);
+        Assert.assertTrue(deserializedFullHll.estimateCardinality() == fullHll.estimateCardinality());
+
+    }
+
+    // keep logic same with C++ version
+    // add additional compare logic with C++ version's estimateValue

Review comment:
       better to add comment in `be/test/olap/hll_test.cpp` to notice that the following test case should be consistent with java version in `fe/src/test/java/org/apache/doris/load/loadv2/HllTest.java`




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