cloud-fan commented on code in PR #46599:
URL: https://github.com/apache/spark/pull/46599#discussion_r1609832522


##########
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationFactory.java:
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@@ -284,4 +284,15 @@ public static UTF8String getCollationKey(UTF8String input, 
int collationId) {
     }
   }
 
+  public static byte[] getCollationKeyBytes(UTF8String input, int collationId) 
{
+    Collation collation = fetchCollation(collationId);
+    if (collation.supportsBinaryEquality) {
+      return input.getBytes();

Review Comment:
   this means memory copy. Shall we make this function return `UTF8String`? 
Then we don't need to call `getBytes` here, and it's pretty easy to create 
`UTF8String` from `byte[]`.



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