rdblue commented on a change in pull request #2680:
URL: https://github.com/apache/iceberg/pull/2680#discussion_r717684387



##########
File path: core/src/main/java/org/apache/iceberg/util/StructLikeMapUtil.java
##########
@@ -0,0 +1,69 @@
+/*
+ * 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.util;
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Map;
+import org.apache.iceberg.StructLike;
+import org.apache.iceberg.types.Types;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class StructLikeMapUtil {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(StructLikeMap.class);
+  private static final String ROCKSDB_DIR_PREFIX = "iceberg-rocksdb-";
+
+  public static final String IMPL = "spill-disk-impl";
+  public static final String IN_MEMORY_MAP = "in-memory";
+  public static final String ROCKSDB_MAP = "rocksdb";
+  public static final String ROCKSDB_DIR = "rocksdb-dir";
+
+  private StructLikeMapUtil() {
+  }
+
+  public static Map<StructLike, StructLike> load(Types.StructType keyType,
+                                                 Types.StructType valType,
+                                                 Map<String, String> 
properties) {

Review comment:
       I don't think that this is a good option for controlling whether this 
feature is turned on. Passing generic properties all the way down to a factory 
method for a specific class isn't a good option. Instead, the calling code 
should decide which map to use. We want to limit where we pass property maps.




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