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From suez1224 <...@git.apache.org>
Subject [GitHub] flink pull request #4585: [FLINK-7491] [Table API & SQL] add MultiSetTypeInf...
Date Wed, 27 Sep 2017 06:46:31 GMT
Github user suez1224 commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4585#discussion_r141255917
  
    --- Diff: flink-core/src/main/java/org/apache/flink/api/java/typeutils/MultisetTypeInfo.java
---
    @@ -0,0 +1,133 @@
    +/*
    + * 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.typeutils;
    +
    +import org.apache.flink.annotation.PublicEvolving;
    +import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
    +import org.apache.flink.api.common.typeinfo.TypeInformation;
    +
    +import java.util.Map;
    +
    +import static org.apache.flink.util.Preconditions.checkNotNull;
    +
    +/**
    + * A {@link TypeInformation} for the Multiset types of the Java API.
    + *
    + * @param <T> The type of the elements in the Multiset.
    + */
    +@PublicEvolving
    +public final class MultisetTypeInfo<T> extends MapTypeInfo<T, Integer> {
    +
    +	private static final long serialVersionUID = 1L;
    +
    +
    +	public MultisetTypeInfo(Class<T> elementTypeClass) {
    +		super(elementTypeClass, Integer.class);
    +	}
    +
    +	public MultisetTypeInfo(TypeInformation<T> elementTypeInfo) {
    +		super(elementTypeInfo, BasicTypeInfo.INT_TYPE_INFO);
    +	}
    +
    +	// ------------------------------------------------------------------------
    +	//  MultisetTypeInfo specific properties
    +	// ------------------------------------------------------------------------
    +
    +	/**
    +	 * Gets the type information for the elements contained in the Multiset
    +	 */
    +	public TypeInformation<T> getElementTypeInfo() {
    +		return getKeyTypeInfo();
    +	}
    +
    +	// ------------------------------------------------------------------------
    +	//  TypeInformation implementation
    +	// ------------------------------------------------------------------------
    +
    +	@Override
    +	public boolean isBasicType() {
    +		return false;
    +	}
    +
    +	@Override
    +	public boolean isTupleType() {
    --- End diff --
    
    done


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