eric-maynard commented on code in PR #1466:
URL: https://github.com/apache/polaris/pull/1466#discussion_r2073971189


##########
polaris-core/src/main/java/org/apache/polaris/core/config/FeatureConfiguration.java:
##########
@@ -234,4 +235,11 @@ public static void enforceFeatureEnabledOrThrow(
           .description("If true, the policy-store endpoints are enabled")
           .defaultValue(true)
           .buildFeatureConfiguration();
+
+  public static final FeatureConfiguration<List<String>> 
SUPPORTED_CATALOG_CONNECTION_TYPES =
+      PolarisConfiguration.<List<String>>builder()
+          .key("SUPPORTED_CATALOG_CONNECTION_TYPES")
+          .description("The list of supported catalog connection types for 
federation")
+          .defaultValue(List.of(ConnectionType.ICEBERG_REST.name(), 
ConnectionType.HADOOP.name()))

Review Comment:
   Maybe one way we can stay consistent with this precedent but also be really 
safe-by-default (beyond what we do for storage types even) is to add a second 
flag gating off support for federation altogether... something like 
`CATALOG_FEDERATION_ENABLED`?



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