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diff --git a/sql/core/src/test/avro/parquet-compat.avdl b/sql/core/src/test/avro/parquet-compat.avdl
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+/*
+ * 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.
+ */
+
+// This is a test protocol for testing parquet-avro compatibility.
+@namespace("org.apache.spark.sql.parquet.test.avro")
+protocol CompatibilityTest {
+    record Nested {
+        array<int> nested_ints_column;
+        string nested_string_column;
+    }
+
+    record ParquetAvroCompat {
+        boolean bool_column;
+        int int_column;
+        long long_column;
+        float float_column;
+        double double_column;
+        bytes binary_column;
+        string string_column;
+
+        union { null, boolean } maybe_bool_column;
+        union { null, int } maybe_int_column;
+        union { null, long } maybe_long_column;
+        union { null, float } maybe_float_column;
+        union { null, double } maybe_double_column;
+        union { null, bytes } maybe_binary_column;
+        union { null, string } maybe_string_column;
+
+        array<string> strings_column;
+        map<int> string_to_int_column;
+        map<array<Nested>> complex_column;
+    }
+}