Fokko commented on code in PR #11811:
URL: https://github.com/apache/iceberg/pull/11811#discussion_r1890758180


##########
core/src/main/java/org/apache/iceberg/data/GenericDataUtil.java:
##########
@@ -0,0 +1,60 @@
+/*
+ * 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.data;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.ByteBuffers;
+import org.apache.iceberg.util.DateTimeUtil;
+
+/** Utility methods for working with Iceberg's generic data model */
+public class GenericDataUtil {
+  private GenericDataUtil() {}
+
+  /**
+   * Convert a value from Iceberg's internal data model to the generic data 
model.
+   *
+   * @param type a data type
+   * @param value value to convert
+   * @return the value in the generic data model representation
+   */
+  public static Object internalToGeneric(Type type, Object value) {
+    if (null == value) {
+      return null;
+    }
+
+    switch (type.typeId()) {
+      case DATE:
+        return DateTimeUtil.dateFromDays((Integer) value);

Review Comment:
   ```suggestion
           return DateTimeUtil.dateFromDays((int) value);
   ```



##########
core/src/main/java/org/apache/iceberg/data/GenericDataUtil.java:
##########
@@ -0,0 +1,60 @@
+/*
+ * 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.data;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.ByteBuffers;
+import org.apache.iceberg.util.DateTimeUtil;
+
+/** Utility methods for working with Iceberg's generic data model */
+public class GenericDataUtil {
+  private GenericDataUtil() {}
+
+  /**
+   * Convert a value from Iceberg's internal data model to the generic data 
model.
+   *
+   * @param type a data type
+   * @param value value to convert
+   * @return the value in the generic data model representation
+   */
+  public static Object internalToGeneric(Type type, Object value) {
+    if (null == value) {
+      return null;
+    }
+
+    switch (type.typeId()) {
+      case DATE:
+        return DateTimeUtil.dateFromDays((Integer) value);
+      case TIME:
+        return DateTimeUtil.timeFromMicros((Long) value);

Review Comment:
   ```suggestion
           return DateTimeUtil.timeFromMicros((long) value);
   ```



##########
core/src/main/java/org/apache/iceberg/data/GenericDataUtil.java:
##########
@@ -0,0 +1,60 @@
+/*
+ * 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.data;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.ByteBuffers;
+import org.apache.iceberg.util.DateTimeUtil;
+
+/** Utility methods for working with Iceberg's generic data model */
+public class GenericDataUtil {
+  private GenericDataUtil() {}
+
+  /**
+   * Convert a value from Iceberg's internal data model to the generic data 
model.
+   *
+   * @param type a data type
+   * @param value value to convert
+   * @return the value in the generic data model representation
+   */
+  public static Object internalToGeneric(Type type, Object value) {
+    if (null == value) {
+      return null;
+    }
+
+    switch (type.typeId()) {
+      case DATE:
+        return DateTimeUtil.dateFromDays((Integer) value);
+      case TIME:
+        return DateTimeUtil.timeFromMicros((Long) value);
+      case TIMESTAMP:
+        if (((Types.TimestampType) type).shouldAdjustToUTC()) {
+          return DateTimeUtil.timestamptzFromMicros((Long) value);

Review Comment:
   ```suggestion
             return DateTimeUtil.timestamptzFromMicros((long) value);
   ```



##########
core/src/main/java/org/apache/iceberg/avro/ValueReaders.java:
##########
@@ -228,7 +249,9 @@ public static List<Pair<Integer, ValueReader<?>>> 
buildReadPlan(
       if (constant != null) {
         readPlan.add(Pair.of(pos, ValueReaders.constant(constant)));
       } else if (field.initialDefault() != null) {
-        readPlan.add(Pair.of(pos, 
ValueReaders.constant(field.initialDefault())));
+        readPlan.add(
+            Pair.of(
+                pos, ValueReaders.constant(convert.apply(field.type(), 
field.initialDefault()))));

Review Comment:
   Let's do that in a separate PR indeed 👍 



##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/SparkUtil.java:
##########
@@ -287,14 +287,15 @@ private static String toExecutorLocation(BlockManagerId 
id) {
    * @param value a value that is an instance of {@link 
Type.TypeID#javaClass()}
    * @return the value converted for Spark
    */
-  public static Object convertConstant(Type type, Object value) {
+  public static Object internalToSpark(Type type, Object value) {
     if (value == null) {
       return null;
     }
 
     switch (type.typeId()) {
       case DECIMAL:
         return Decimal.apply((BigDecimal) value);
+      case UUID:

Review Comment:
   Good catch:
   
   <img width="1512" alt="image" 
src="https://github.com/user-attachments/assets/7cce1656-dc47-41d0-aeca-5abc2d065c5c";
 />
   



##########
core/src/main/java/org/apache/iceberg/data/GenericDataUtil.java:
##########
@@ -0,0 +1,60 @@
+/*
+ * 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.data;
+
+import java.nio.ByteBuffer;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+import org.apache.iceberg.util.ByteBuffers;
+import org.apache.iceberg.util.DateTimeUtil;
+
+/** Utility methods for working with Iceberg's generic data model */
+public class GenericDataUtil {
+  private GenericDataUtil() {}
+
+  /**
+   * Convert a value from Iceberg's internal data model to the generic data 
model.
+   *
+   * @param type a data type
+   * @param value value to convert
+   * @return the value in the generic data model representation
+   */
+  public static Object internalToGeneric(Type type, Object value) {
+    if (null == value) {
+      return null;
+    }
+
+    switch (type.typeId()) {
+      case DATE:
+        return DateTimeUtil.dateFromDays((Integer) value);
+      case TIME:
+        return DateTimeUtil.timeFromMicros((Long) value);
+      case TIMESTAMP:
+        if (((Types.TimestampType) type).shouldAdjustToUTC()) {
+          return DateTimeUtil.timestamptzFromMicros((Long) value);
+        } else {
+          return DateTimeUtil.timestampFromMicros((Long) value);

Review Comment:
   ```suggestion
             return DateTimeUtil.timestampFromMicros((long) value);
   ```



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