snuyanzin commented on code in PR #27183:
URL: https://github.com/apache/flink/pull/27183#discussion_r2485023361


##########
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/utils/DiffRepository.java:
##########
@@ -188,18 +197,42 @@ public class DiffRepository {
      * share the same diff-repository: if the repository gets loaded once per 
test case, then only
      * one diff is recorded.
      */
-    private static final Map<Class<?>, DiffRepository> MAP_CLASS_TO_REPOSITORY 
= new HashMap<>();
+    private static final LoadingCache<Key, DiffRepository> REPOSITORY_CACHE =

Review Comment:
   Mostly synced with updates from Calcite version, also fixed some bugs both 
here and in Calcite, like e.g. https://github.com/apache/calcite/pull/4612



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