snazy commented on code in PR #9905:
URL: https://github.com/apache/iceberg/pull/9905#discussion_r1680492194


##########
orc/src/test/java/org/apache/iceberg/orc/TestBuildOrcProjection.java:
##########
@@ -23,7 +23,9 @@
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
 
+import org.apache.hadoop.conf.Configuration;

Review Comment:
   Please clean those up



##########
orc/src/main/java/org/apache/iceberg/orc/ORCSchemaUtil.java:
##########
@@ -296,24 +304,36 @@ private static TypeDescription buildOrcProjection(
                 list.elementId(),
                 list.elementType(),
                 isRequired && list.isElementRequired(),
-                mapping);
+                mapping,
+                config);
         orcType = TypeDescription.createList(elementType);
         break;
       case MAP:
         Types.MapType map = (Types.MapType) type;
         TypeDescription keyType =
-            buildOrcProjection(map.keyId(), map.keyType(), isRequired, 
mapping);
+            buildOrcProjection(map.keyId(), map.keyType(), isRequired, 
mapping, config);
         TypeDescription valueType =
             buildOrcProjection(
-                map.valueId(), map.valueType(), isRequired && 
map.isValueRequired(), mapping);
+                map.valueId(),
+                map.valueType(),
+                isRequired && map.isValueRequired(),
+                mapping,
+                config);
         orcType = TypeDescription.createMap(keyType, valueType);
         break;
       default:
         if (mapping.containsKey(fieldId)) {
           TypeDescription originalType = mapping.get(fieldId).type();
           Optional<TypeDescription> promotedType = getPromotedType(type, 
originalType);
 
-          if (promotedType.isPresent()) {
+          boolean convertTimestampTZ =
+              config.getBoolean(ConfigProperties.ORC_CONVERT_TIMESTAMPTZ, 
false);
+
+          if (convertTimestampTZ
+              && type.typeId() == Type.TypeID.TIMESTAMP

Review Comment:
   Fair enough



##########
orc/src/main/java/org/apache/iceberg/orc/ORCSchemaUtil.java:
##########
@@ -261,12 +261,30 @@ public static Schema convert(TypeDescription orcSchema) {
    */
   public static TypeDescription buildOrcProjection(
       Schema schema, TypeDescription originalOrcSchema) {
+    return buildOrcProjection(schema, originalOrcSchema, false);
+  }
+
+  /**
+   * Overload function `buildOrcProjection`
+   *
+   * @param schema an Iceberg schema
+   * @param originalOrcSchema an existing ORC file schema
+   * @param convertTimestampTZ should convert timestamptz as timestamp
+   * @return the resulting ORC schema
+   */
+  public static TypeDescription buildOrcProjection(
+      Schema schema, TypeDescription originalOrcSchema, Boolean 
convertTimestampTZ) {
     final Map<Integer, OrcField> icebergToOrc = icebergToOrcMapping("root", 
originalOrcSchema);
-    return buildOrcProjection(Integer.MIN_VALUE, schema.asStruct(), true, 
icebergToOrc);
+    return buildOrcProjection(
+        Integer.MIN_VALUE, schema.asStruct(), true, icebergToOrc, 
convertTimestampTZ);
   }
 
   private static TypeDescription buildOrcProjection(
-      Integer fieldId, Type type, boolean isRequired, Map<Integer, OrcField> 
mapping) {
+      Integer fieldId,
+      Type type,
+      boolean isRequired,
+      Map<Integer, OrcField> mapping,
+      Boolean convertTimestampTZ) {

Review Comment:
   This shouldn't be a boxed type



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