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https://issues.apache.org/jira/browse/FLINK-7206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105190#comment-16105190
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ASF GitHub Bot commented on FLINK-7206:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4355#discussion_r130086695
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/dataview/MapViewTypeInfo.scala
 ---
    @@ -0,0 +1,81 @@
    +/*
    + * 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.table.dataview
    +
    +import org.apache.flink.annotation.PublicEvolving
    +import org.apache.flink.api.common.ExecutionConfig
    +import org.apache.flink.api.common.typeinfo.TypeInformation
    +import org.apache.flink.api.common.typeutils.TypeSerializer
    +import org.apache.flink.api.common.typeutils.base.MapSerializer
    +import org.apache.flink.table.api.dataview.MapView
    +
    +/**
    +  * [[MapView]] type information.
    +  *
    +  * @param keyType key type information
    +  * @param valueType value type information
    +  * @tparam K key type
    +  * @tparam V value type
    +  */
    +@PublicEvolving
    +class  MapViewTypeInfo[K, V](
    +    val keyType: TypeInformation[K],
    +    val valueType: TypeInformation[V])
    +  extends TypeInformation[MapView[K, V]] {
    +
    +  @PublicEvolving
    +  override def isBasicType = false
    +
    +  @PublicEvolving
    +  override def isTupleType = false
    +
    +  @PublicEvolving
    +  override def getArity = 0
    --- End diff --
    
    should be `1`


> Implementation of DataView to support state access for UDAGG
> ------------------------------------------------------------
>
>                 Key: FLINK-7206
>                 URL: https://issues.apache.org/jira/browse/FLINK-7206
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: Kaibo Zhou
>            Assignee: Kaibo Zhou
>
> Implementation of MapView and ListView to support state access for UDAGG.



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