danielcweeks commented on code in PR #12060:
URL: https://github.com/apache/iceberg/pull/12060#discussion_r1927511341


##########
core/src/main/java/org/apache/iceberg/InternalData.java:
##########
@@ -0,0 +1,159 @@
+/*
+ * 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 java.io.IOException;
+import java.util.Map;
+import java.util.function.Function;
+import org.apache.iceberg.avro.Avro;
+import org.apache.iceberg.common.DynMethods;
+import org.apache.iceberg.io.CloseableIterable;
+import org.apache.iceberg.io.FileAppender;
+import org.apache.iceberg.io.InputFile;
+import org.apache.iceberg.io.OutputFile;
+import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class InternalData {
+  private InternalData() {}
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(InternalData.class);
+  private static final Map<FileFormat, Function<OutputFile, WriteBuilder>> 
WRITE_BUILDERS =
+      Maps.newConcurrentMap();
+  private static final Map<FileFormat, Function<InputFile, ReadBuilder>> 
READ_BUILDERS =
+      Maps.newConcurrentMap();
+
+  static {
+    Avro.register();
+
+    try {
+      DynMethods.StaticMethod registerParquet =
+          DynMethods.builder("register")
+              .impl("org.apache.iceberg.parquet.Parquet")
+              .buildStaticChecked();
+
+      registerParquet.invoke();
+
+    } catch (NoSuchMethodException e) {
+      // failing to load Parquet is normal and does not require a stack trace
+      LOG.info("Unable to register Parquet for metadata files: {}", 
e.getMessage());
+    }
+  }
+
+  public static void register(

Review Comment:
   I would just counter that it's easier to open up in the future if there's a 
good use case, but it's hard to close this door if we expose registration.



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