[GitHub] [iceberg] rdblue commented on a change in pull request #2164: Core: Allow building unsorted orders

[GitBox <gi...@apache.org>]

rdblue commented on a change in pull request #2164:
URL: https://github.com/apache/iceberg/pull/2164#discussion_r565682699



##########
File path: api/src/main/java/org/apache/iceberg/SortOrder.java
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@@ -258,14 +257,20 @@ Builder addSortField(String transformAsString, int sourceId, SortDirection direc
     }
 
     public SortOrder build() {
-      if (orderId == 0 && fields.size() != 0) {
-        throw new IllegalArgumentException("Sort order ID 0 is reserved for unsorted order");
+      if (fields.isEmpty()) {
+        if (orderId != null && orderId != 0) {
+          throw new IllegalArgumentException("Unsorted order ID must be 0");
+        }
+        return SortOrder.unsorted();
       }
-      if (fields.size() == 0 && orderId != 0) {
-        throw new IllegalArgumentException("Unsorted order ID must be 0");
+
+      if (orderId != null && orderId == 0) {

Review comment:
       If `orderId == 0`, then it can't be null, so the null check is redundant.




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