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https://issues.apache.org/jira/browse/HIVE-26243?focusedWorklogId=827138&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-827138
]
ASF GitHub Bot logged work on HIVE-26243:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 18/Nov/22 12:14
Start Date: 18/Nov/22 12:14
Worklog Time Spent: 10m
Work Description: deniskuzZ commented on code in PR #3317:
URL: https://github.com/apache/hive/pull/3317#discussion_r1026365965
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/histogram/kll/KllUtils.java:
##########
@@ -0,0 +1,106 @@
+/*
+ * 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.hadoop.hive.ql.udf.generic.histogram.kll;
+
+import org.apache.datasketches.kll.KllFloatsSketch;
+import org.apache.datasketches.memory.Memory;
+import org.apache.hadoop.hive.ql.util.JavaDataModel;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+/**
+ * KLL serialization utilities.
+ */
+public class KllUtils {
+
+ private KllUtils() {
+ throw new AssertionError("Suppress default constructor for non
instantiation");
+ }
+
+ /**
+ * KLL is serialized according to what provided by data-sketches library
+ * @param out output stream to write to
+ * @param kll KLL sketch that needs to be serialized
+ * @throws IOException if an error occurs during serialization
+ */
+ public static void serializeKll(OutputStream out, KllFloatsSketch kll)
throws IOException {
+ out.write(kll.toByteArray());
+ }
+
+ /**
+ * This function deserializes the serialized KLL sketch from a stream.
+ * @param in input stream to be deserialized
+ * @return KLL sketch
+ * @throws IOException if errors occur while reading the stream
+ */
+ public static KllFloatsSketch deserializeKll(InputStream in) throws
IOException {
Review Comment:
please make sure you do not have a dead code, haven't found any usage of
this method
Issue Time Tracking
-------------------
Worklog Id: (was: 827138)
Time Spent: 5.5h (was: 5h 20m)
> Add vectorized implementation of the 'ds_kll_sketch' UDAF
> ---------------------------------------------------------
>
> Key: HIVE-26243
> URL: https://issues.apache.org/jira/browse/HIVE-26243
> Project: Hive
> Issue Type: Improvement
> Components: UDF, Vectorization
> Affects Versions: 4.0.0-alpha-2
> Reporter: Alessandro Solimando
> Assignee: Alessandro Solimando
> Priority: Major
> Labels: pull-request-available
> Time Spent: 5.5h
> Remaining Estimate: 0h
>
> _ds_kll_sketch_ UDAF does not have a vectorized implementation at the moment,
> the present ticket aims at bridging this gap.
> This is particularly important because vectorization has an "all or nothing"
> approach, so if this function is used at the side of vectorized functions,
> they won't be able to benefit from vectorized execution.
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