rdblue commented on code in PR #12238:
URL: https://github.com/apache/iceberg/pull/12238#discussion_r1955053312


##########
core/src/main/java/org/apache/iceberg/avro/Variant.java:
##########
@@ -0,0 +1,47 @@
+/*
+ * 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.avro;
+
+import org.apache.avro.LogicalType;
+import org.apache.avro.Schema;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+
+public class Variant extends LogicalType {
+  static final String NAME = "variant";
+  private static final Variant INSTANCE = new Variant();
+
+  static Variant get() {
+    return INSTANCE;
+  }
+
+  private Variant() {
+    super(NAME);
+  }
+
+  @Override
+  public void validate(Schema schema) {
+    super.validate(schema);
+    Preconditions.checkArgument(
+        schema.getType() == Schema.Type.RECORD,
+        "Invalid type for variant, must be a record: %s",
+        schema);
+    Preconditions.checkArgument(
+        AvroSchemaUtil.isVariantSchema(schema), "Invalid variant record: %s", 
schema);

Review Comment:
   I think this should check that the fields are binary since it is validating 
that the schema can be used to store variant data.



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