[
https://issues.apache.org/jira/browse/HIVEMALL-253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16859732#comment-16859732
]
ASF GitHub Bot commented on HIVEMALL-253:
-----------------------------------------
myui commented on pull request #192: [HIVEMALL-253]UDF map_roulette() created
URL: https://github.com/apache/incubator-hivemall/pull/192#discussion_r291890409
##########
File path: core/src/main/java/hivemall/tools/map/MapRouletteUDF.java
##########
@@ -0,0 +1,192 @@
+/*
+ * 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 hivemall.tools.map;
+
+import hivemall.utils.hadoop.HiveUtils;
+import org.apache.hadoop.hive.ql.exec.*;
+import org.apache.hadoop.hive.ql.metadata.HiveException;
+import org.apache.hadoop.hive.ql.udf.UDFType;
+import org.apache.hadoop.hive.ql.udf.generic.GenericUDF;
+import org.apache.hadoop.hive.serde2.objectinspector.MapObjectInspector;
+import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
+import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
+import
org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;
+import java.util.*;
+import static hivemall.HivemallConstants.*;
+
+/**
+ * The map_roulette() can be use to do roulette, according to each map.entry
's weight.
+ *
+ * @author Wang, Yizheng
Review comment:
"@ author" tag is not used in ASF coding conversion. Commit history shows
you as a contributor as seen in
https://github.com/apache/incubator-hivemall/graphs/contributors
see
https://www.theinquirer.net/inquirer/news/1037207/apache-enforces-the-removal-of-author-tags
https://github.com/apache/dubbo/issues/2317
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> UDF map_roulette() created
> --------------------------
>
> Key: HIVEMALL-253
> URL: https://issues.apache.org/jira/browse/HIVEMALL-253
> Project: Hivemall
> Issue Type: New Feature
> Affects Versions: 0.6.0
> Reporter: Aaron Wong
> Assignee: Makoto Yui
> Priority: Major
>
> In data processing process, we usually encounter the problem that we have
> some selection and their probably(or weight), we should select one of them
> according to their probably(or weight).
> UDF map_roulette() is a implement of roulette. It can select a Key from a map
> according to key's weight value.
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