@Test
  public void testWriteMapOfStructsInTable() throws IOException {
    Schema schema = new Schema(required(1, "id", Types.LongType.get()),
        required(2, "mapofstructs", Types.MapType.ofRequired(3, 4, Types.StringType.get(),
            Types.StructType.of(required(5, "something", Types.StringType.get()),
                required(6, "someone", Types.StringType.get()),
                required(7, "somewhere", Types.StringType.get())))));
    List<Record> records = TestHelper.generateRandomRecords(schema, 5, 0L);
    testComplexTypeWrite(schema, records);
  }
Runs insert queries against Iceberg tables with complex type columns, such as arrays, structs and maps.
iceberg/iceberg-handler/src/test/java/org/apache/iceberg/mr/hive/TestHiveIcebergComplexTypeWrites.java