rdblue commented on a change in pull request #1919:
URL: https://github.com/apache/iceberg/pull/1919#discussion_r542636561



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File path: core/src/test/java/org/apache/iceberg/TestUpdatePartitionSpecV1.java
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@@ -0,0 +1,444 @@
+/*
+ * 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;
+
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
+import org.apache.iceberg.transforms.Transforms;
+import org.apache.iceberg.types.Types;
+import org.junit.Assert;
+import org.junit.Test;
+
+import static org.apache.iceberg.expressions.Expressions.bucket;
+import static org.apache.iceberg.expressions.Expressions.day;
+import static org.apache.iceberg.expressions.Expressions.hour;
+import static org.apache.iceberg.expressions.Expressions.month;
+import static org.apache.iceberg.expressions.Expressions.ref;
+import static org.apache.iceberg.expressions.Expressions.truncate;
+import static org.apache.iceberg.expressions.Expressions.year;
+
+public class TestUpdatePartitionSpecV1 {

Review comment:
       The expected result of any combination should be the same as if the two 
were done as separate changes, except for cases that signal some problem. For 
example, renaming a field and deleting the original field shows that there are 
two conflicting changes, even though we could apply one and then fail the 
second.
   
   I agree that this should have a test for that case, as well as possibly some 
additional checks for consistency with rename.




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