eric-maynard commented on code in PR #1959:
URL: https://github.com/apache/polaris/pull/1959#discussion_r2184275829


##########
polaris-core/src/main/java/org/apache/polaris/core/config/PolarisConfigurationStore.java:
##########
@@ -99,7 +99,25 @@ public interface PolarisConfigurationStore {
    */
   default <T> @Nonnull T getConfiguration(
       @Nonnull RealmContext realmContext, PolarisConfiguration<T> config) {
-    T result = getConfiguration(realmContext, config.key, config.defaultValue);
+    T result = getConfiguration(realmContext, config.key);
+
+    if (result == null && config.hasLegacyKeys()) {
+      for (String legacyKey : config.legacyKeys) {
+        result = getConfiguration(realmContext, legacyKey);
+        if (result != null) {
+          LOGGER.warn(
+              "Legacy configuration key '{}' is in use. Please use '{}' 
instead.",
+              legacyKey,
+              config.key);
+          break;

Review Comment:
   The cast is just `tryCast(config, result)` which is not a crazy amount of 
logic to replicate. But I wouldn't advocate for the early return either, 
because of reason (1) above



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