olaky commented on code in PR #46280:
URL: https://github.com/apache/spark/pull/46280#discussion_r1603191384


##########
common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationFactory.java:
##########
@@ -36,11 +36,45 @@
  * Provides functionality to the UTF8String object which respects defined 
collation settings.
  */
 public final class CollationFactory {
+
+  /**
+   * Identifier for single a collation.
+   */
+  public static class CollationIdentifier {
+    public final String provider;
+    public final String name;
+    public final String version;

Review Comment:
   Honestly not too familiar with how this is usually done in Java, but 
Optional would clearly express that the absence is not a bug (which a null 
often indicates)



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