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https://issues.apache.org/jira/browse/FLINK-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229984#comment-14229984
]
ASF GitHub Bot commented on FLINK-1112:
---------------------------------------
Github user fhueske commented on a diff in the pull request:
https://github.com/apache/incubator-flink/pull/209#discussion_r21099647
--- Diff:
flink-java/src/main/java/org/apache/flink/api/java/operators/translation/Tuple3UnwrappingIterator.java
---
@@ -0,0 +1,73 @@
+/*
+ * 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.operators.translation;
+
+import java.util.Iterator;
+
+import org.apache.flink.api.java.tuple.Tuple3;
+import org.apache.flink.util.TraversableOnceException;
+
+/**
+ * An iterator that reads 3-tuples (groupKey, sortKey, value) and returns
only the values (thrid field).
+ * The iterator also tracks the groupKeys, as the triples flow though it.
+ */
+public class Tuple3UnwrappingIterator<T, K1, K2> implements Iterator<T>,
Iterable<T>, java.io.Serializable {
+
+ private static final long serialVersionUID = 1L;
+
+ private K1 lastKey;
--- End diff --
The sortkey must also be remembered.
> Add GroupSorting with KeySelectors
> ----------------------------------
>
> Key: FLINK-1112
> URL: https://issues.apache.org/jira/browse/FLINK-1112
> Project: Flink
> Issue Type: Improvement
> Components: Java API, Scala API
> Reporter: Fabian Hueske
> Assignee: Mingliang Qi
>
> Group sorting is currently only supported for field-index keys and not for
> KeySelectors.
> This feature was requested.
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