rdblue commented on a change in pull request #1096:
URL: https://github.com/apache/iceberg/pull/1096#discussion_r438279601



##########
File path: flink/src/test/java/org/apache/iceberg/flink/TestFlinkSchemaUtil.java
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@@ -0,0 +1,89 @@
+/*
+ * 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.iceberg.flink;
+
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.api.TableSchema;
+import org.apache.iceberg.Schema;
+import org.apache.iceberg.types.Types;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class TestFlinkSchemaUtil {

Review comment:
       Why use the list's nullability for whether the elements in the list are 
nullable? It looks like that was correct before.
   
   The [javadoc for 
`isNullable`](https://javadoc.io/static/org.apache.flink/flink-table-common/1.10.1/org/apache/flink/table/types/logical/LogicalTypeVisitor.html)
 is "Returns whether a value of this type can be null". That sounds like it 
describes whether the list can be null or not. The element type has its own 
nullability that describes whether the elements can be null. I think it was 
correct before.




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