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https://issues.apache.org/jira/browse/FLINK-7206?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16105205#comment-16105205
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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_r130075088
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/dataview/ListViewTypeInfo.scala
---
@@ -0,0 +1,69 @@
+/*
+ * 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.ListSerializer
+import org.apache.flink.table.api.dataview.ListView
+
+/**
+ * [[ListView]] type information.
+ *
+ * @param elementType element type information
+ * @tparam T element type
+ */
+@PublicEvolving
+class ListViewTypeInfo[T](val elementType: TypeInformation[T])
+ extends TypeInformation[ListView[T]] {
+
+ override def isBasicType: Boolean = false
+
+ override def isTupleType: Boolean = false
+
+ override def getArity: Int = 0
--- End diff --
This must 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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