[GitHub] [pinot] cbalci commented on a diff in pull request #10643: Add PercentileKLL aggregation function

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

cbalci commented on code in PR #10643:
URL: https://github.com/apache/pinot/pull/10643#discussion_r1185357411


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/customobject/SerializedKLL.java:
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@@ -0,0 +1,49 @@
+/**
+ * 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.pinot.segment.local.customobject;
+
+import java.util.Base64;
+import org.apache.datasketches.kll.KllDoublesSketch;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+/**
+ * Serialized and comparable version of KllDoublesSketch.
+ * Compares two sketches for a specific percentile value.
+ */
+public class SerializedKLL implements Comparable<SerializedKLL> {
+  private final double _quantile;

Review Comment:
   Good question. That is used when we want to sort (ORDER BY) sketches.



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