Re: [PR] Exact Cardinality Count extension (druid)

["FrankChen021 (via GitHub)" <gi...@apache.org>]

FrankChen021 commented on code in PR #18021:
URL: https://github.com/apache/druid/pull/18021#discussion_r2176303111


##########
extensions-contrib/druid-exact-cardinality/src/main/java/org/apache/druid/query/aggregation/exact/cardinality/bitmap64/Bitmap64ExactCardinalityAggregatorFactory.java:
##########
@@ -0,0 +1,203 @@
+/*
+ * 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.druid.query.aggregation.exact.cardinality.bitmap64;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import org.apache.druid.query.aggregation.AggregateCombiner;
+import org.apache.druid.query.aggregation.AggregatorFactory;
+import org.apache.druid.query.aggregation.ObjectAggregateCombiner;
+import org.apache.druid.query.cache.CacheKeyBuilder;
+import org.apache.druid.segment.ColumnValueSelector;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Base class for both build and merge factories
+ */
+public abstract class Bitmap64ExactCardinalityAggregatorFactory extends AggregatorFactory
+{
+  static final int MAX_INTERMEDIATE_SIZE = 1024; // 1 KiB

Review Comment:
   let's put these comments as java doc in the code



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