From 3970b55e85604861a40aa2d63d2c4f2e55d043d6 Mon Sep 17 00:00:00 2001
From: Steven Wu <stevenz3wu@gmail.com>
Date: Thu, 8 Jun 2023 07:33:04 -0700
Subject: [PATCH] add copy method to SortKey

---
 api/src/main/java/org/apache/iceberg/SortKey.java | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/api/src/main/java/org/apache/iceberg/SortKey.java b/api/src/main/java/org/apache/iceberg/SortKey.java
index 386f7a101fb7..0a06ffa65a4c 100644
--- a/api/src/main/java/org/apache/iceberg/SortKey.java
+++ b/api/src/main/java/org/apache/iceberg/SortKey.java
@@ -33,6 +33,15 @@ public SortKey(Schema schema, SortOrder sortOrder) {
     super(schema, fieldTransform(sortOrder));
   }
 
+  private SortKey(SortKey toCopy) {
+    // only need deep copy inside StructTransform
+    super(toCopy);
+  }
+
+  public SortKey copy() {
+    return new SortKey(this);
+  }
+
   private static List<FieldTransform> fieldTransform(SortOrder sortOrder) {
     return sortOrder.fields().stream()
         .map(sortField -> new FieldTransform(sortField.sourceId(), sortField.transform()))