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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-1112) Add GroupSorting with KeySelectors
Date Mon, 01 Dec 2014 16:30:13 GMT

    [ 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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