[
https://issues.apache.org/jira/browse/BEAM-7013?focusedWorklogId=298178&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-298178
]
ASF GitHub Bot logged work on BEAM-7013:
----------------------------------------
Author: ASF GitHub Bot
Created on: 20/Aug/19 20:51
Start Date: 20/Aug/19 20:51
Worklog Time Spent: 10m
Work Description: robinyqiu commented on pull request #9144: [BEAM-7013]
Integrating ZetaSketch's HLL++ algorithm with Beam
URL: https://github.com/apache/beam/pull/9144#discussion_r315874860
##########
File path:
sdks/java/extensions/zetasketch/src/test/java/org/apache/beam/sdk/extensions/zetasketch/HllCountTest.java
##########
@@ -0,0 +1,373 @@
+/*
+ * 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.beam.sdk.extensions.zetasketch;
+
+import com.google.zetasketch.HyperLogLogPlusPlus;
+import com.google.zetasketch.shaded.com.google.protobuf.ByteString;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import org.apache.beam.sdk.Pipeline.PipelineExecutionException;
+import org.apache.beam.sdk.testing.NeedsRunner;
+import org.apache.beam.sdk.testing.PAssert;
+import org.apache.beam.sdk.testing.TestPipeline;
+import org.apache.beam.sdk.transforms.Create;
+import org.apache.beam.sdk.values.KV;
+import org.apache.beam.sdk.values.PCollection;
+import org.apache.beam.sdk.values.TypeDescriptor;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.rules.ExpectedException;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link HllCount}. */
+@RunWith(JUnit4.class)
+public class HllCountTest {
+
+ @Rule public final transient TestPipeline p = TestPipeline.create();
+ @Rule public transient ExpectedException thrown = ExpectedException.none();
+
+ // Integer
+ private static final List<Integer> INTS1 = Arrays.asList(1, 2, 3, 3, 1, 4);
+ private static final byte[] INTS1_SKETCH;
+ private static final Long INTS1_ESTIMATE;
+
+ static {
+ HyperLogLogPlusPlus<Integer> hll = new
HyperLogLogPlusPlus.Builder().buildForIntegers();
+ INTS1.forEach(hll::add);
+ INTS1_SKETCH = hll.serializeToByteArray();
+ INTS1_ESTIMATE = hll.longResult();
+ }
+
+ private static final List<Integer> INTS2 = Arrays.asList(3, 3, 3, 3);
+ private static final byte[] INTS2_SKETCH;
+ private static final Long INTS2_ESTIMATE;
+
+ static {
+ HyperLogLogPlusPlus<Integer> hll = new
HyperLogLogPlusPlus.Builder().buildForIntegers();
+ INTS2.forEach(hll::add);
+ INTS2_SKETCH = hll.serializeToByteArray();
+ INTS2_ESTIMATE = hll.longResult();
+ }
+
+ private static final byte[] INTS1_INTS2_SKETCH;
+
+ static {
+ HyperLogLogPlusPlus<?> hll = HyperLogLogPlusPlus.forProto(INTS1_SKETCH);
+ hll.merge(INTS2_SKETCH);
+ INTS1_INTS2_SKETCH = hll.serializeToByteArray();
+ }
+
+ // Long
+ private static final List<Long> LONGS = Collections.singletonList(1L);
+ private static final byte[] LONGS_SKETCH;
+
+ static {
+ HyperLogLogPlusPlus<Long> hll = new
HyperLogLogPlusPlus.Builder().buildForLongs();
+ LONGS.forEach(hll::add);
+ LONGS_SKETCH = hll.serializeToByteArray();
+ }
+
+ private static final byte[] LONGS_EMPTY_SKETCH;
+
+ static {
+ HyperLogLogPlusPlus<Long> hll = new
HyperLogLogPlusPlus.Builder().buildForLongs();
+ LONGS_EMPTY_SKETCH = hll.serializeToByteArray();
+ }
+
+ // String
+ private static final List<String> STRINGS = Arrays.asList("s1", "s2", "s1",
"s2");
+ private static final byte[] STRINGS_SKETCH;
+
+ static {
+ HyperLogLogPlusPlus<String> hll = new
HyperLogLogPlusPlus.Builder().buildForStrings();
+ STRINGS.forEach(hll::add);
+ STRINGS_SKETCH = hll.serializeToByteArray();
+ }
+
+ private static final int TEST_PRECISION = 20;
+ private static final byte[] STRINGS_SKETCH_TEST_PRECISION;
+
+ static {
+ HyperLogLogPlusPlus<String> hll =
+ new
HyperLogLogPlusPlus.Builder().normalPrecision(TEST_PRECISION).buildForStrings();
+ STRINGS.forEach(hll::add);
+ STRINGS_SKETCH_TEST_PRECISION = hll.serializeToByteArray();
+ }
+
+ // Bytes
+ private static final byte[] BYTES0 = {(byte) 0x1, (byte) 0xa};
+ private static final byte[] BYTES1 = {(byte) 0xf};
+ private static final List<byte[]> BYTES = Arrays.asList(BYTES0, BYTES1);
+ private static final byte[] BYTES_SKETCH;
+
+ static {
+ HyperLogLogPlusPlus<ByteString> hll = new
HyperLogLogPlusPlus.Builder().buildForBytes();
+ BYTES.forEach(hll::add);
+ BYTES_SKETCH = hll.serializeToByteArray();
+ }
+
+ @Test
+ @Category(NeedsRunner.class)
+ public void testInitForIntegersGlobally() {
+ PCollection<byte[]> result =
+
p.apply(Create.of(INTS1)).apply(HllCount.Init.forIntegers().globally());
+
+ PAssert.thatSingleton(result).isEqualTo(INTS1_SKETCH);
+ p.run();
+ }
+
+ @Test
+ @Category(NeedsRunner.class)
+ public void testInitForLongsGlobally() {
+ PCollection<byte[]> result =
+ p.apply(Create.of(LONGS)).apply(HllCount.Init.forLongs().globally());
+
+ PAssert.thatSingleton(result).isEqualTo(LONGS_SKETCH);
+ p.run();
+ }
+
+ @Test
+ @Category(NeedsRunner.class)
+ public void testInitForLongsGlobally_EmptyInput() {
+ PCollection<byte[]> result =
+ p.apply(Create.empty(TypeDescriptor.of(Long.class)))
+ .apply(HllCount.Init.forLongs().globally());
Review comment:
This behavior is defined by the `withoutDefaults` call here in
https://github.com/apache/beam/blob/944b0870fbfeb4d09190fac838bb16d2e6bbce8f/sdks/java/extensions/zetasketch/src/main/java/org/apache/beam/sdk/extensions/zetasketch/HllCount.java#L242-L244
and documented in
https://github.com/apache/beam/blob/944b0870fbfeb4d09190fac838bb16d2e6bbce8f/sdks/java/extensions/zetasketch/src/main/java/org/apache/beam/sdk/extensions/zetasketch/HllCount.java#L240
We can change this behavior to return an sketch of an empty set. I made this
decision such that it will be consistent with `HllCount.MergePartial`, for
which we much return nothing because there is no "identity element" (or
default) we can return.
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Issue Time Tracking
-------------------
Worklog Id: (was: 298178)
Time Spent: 23h 50m (was: 23h 40m)
> A new count distinct transform based on BigQuery compatible HyperLogLog++
> implementation
> ----------------------------------------------------------------------------------------
>
> Key: BEAM-7013
> URL: https://issues.apache.org/jira/browse/BEAM-7013
> Project: Beam
> Issue Type: New Feature
> Components: extensions-java-sketching, sdk-java-core
> Reporter: Yueyang Qiu
> Assignee: Yueyang Qiu
> Priority: Major
> Fix For: 2.16.0
>
> Time Spent: 23h 50m
> Remaining Estimate: 0h
>
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