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https://issues.apache.org/jira/browse/FLINK-703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14480902#comment-14480902
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ASF GitHub Bot commented on FLINK-703:
--------------------------------------
Github user hsaputra commented on a diff in the pull request:
https://github.com/apache/flink/pull/572#discussion_r27784222
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/functions/BasicKeySelector.java
---
@@ -0,0 +1,26 @@
+/*
+ * 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.flink.api.java.functions;
+
+public class BasicKeySelector<T> implements KeySelector<T, T> {
--- End diff --
Please add JavaDoc explaining why the class is introduced and its
relationships with others.
> Use complete element as join key.
> ---------------------------------
>
> Key: FLINK-703
> URL: https://issues.apache.org/jira/browse/FLINK-703
> Project: Flink
> Issue Type: Improvement
> Reporter: GitHub Import
> Assignee: Chiwan Park
> Priority: Trivial
> Labels: github-import
> Fix For: pre-apache
>
>
> In some situations such as semi-joins it could make sense to use a complete
> element as join key.
> Currently this can be done using a key-selector function, but we could offer
> a shortcut for that.
> This is not an urgent issue, but might be helpful.
> ---------------- Imported from GitHub ----------------
> Url: https://github.com/stratosphere/stratosphere/issues/703
> Created by: [fhueske|https://github.com/fhueske]
> Labels: enhancement, java api, user satisfaction,
> Milestone: Release 0.6 (unplanned)
> Created at: Thu Apr 17 23:40:00 CEST 2014
> State: open
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