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From fhueske <...@git.apache.org>
Subject [GitHub] flink pull request: FLINK-3254: Adding functionality to support th...
Date Mon, 01 Feb 2016 14:46:50 GMT
Github user fhueske commented on a diff in the pull request:

    --- Diff: flink-core/src/main/java/org/apache/flink/api/common/functions/util/CombineToGroupCombineWrapper.java
    @@ -0,0 +1,49 @@
    + * 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.common.functions.util;
    +import com.google.common.base.Preconditions;
    +import org.apache.flink.api.common.functions.CombineFunction;
    +import org.apache.flink.api.common.functions.GroupCombineFunction;
    +import org.apache.flink.api.common.functions.GroupReduceFunction;
    +import org.apache.flink.util.Collector;
    + * A wrapper the wraps a function that implements both {@link CombineFunction} and {@link
GroupReduceFunction} interfaces
    + * and makes it look like a function that implements {@link GroupCombineFunction} and
{@link GroupReduceFunction} to the runtime.
    + */
    +public class CombineToGroupCombineWrapper<IN, OUT, F extends CombineFunction<IN,
OUT> & GroupReduceFunction<IN, OUT>>
    --- End diff --
    The generic parameters of the `CombineFunction` and `GroupCombineFunction` should be `<IN,

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