eric-maynard commented on code in PR #1532:
URL: https://github.com/apache/polaris/pull/1532#discussion_r2086170234


##########
polaris-core/src/main/java/org/apache/polaris/core/config/FeatureConfiguration.java:
##########
@@ -234,4 +233,38 @@ public static void enforceFeatureEnabledOrThrow(
           .description("If true, the policy-store endpoints are enabled")
           .defaultValue(true)
           .buildFeatureConfiguration();
+
+  public static final FeatureConfiguration<Boolean> 
ALLOW_SPECIFYING_FILE_IO_IMPL =
+      PolarisConfiguration.<Boolean>builder()
+          .key("ALLOW_SPECIFYING_FILE_IO_IMPL")
+          .description(
+              "Config key for whether to allow setting the FILE_IO_IMPL using 
catalog properties. "
+                  + "Must only be enabled in dev/test environments, never in 
production systems.")
+          .defaultValue(false)
+          .buildFeatureConfiguration();
+
+  public static final FeatureConfiguration<Boolean>

Review Comment:
   I think you are (and maybe this PR is) conflating two things -- FILE storage 
type and HadoopFileIO. They are not always the same.
   
   `SUPPORTED_CATALOG_STORAGE_TYPES` is probably sufficient to disallow the 
FILE storage type. `FILE` shouldn't be in the default, but I think it's too 
great a leap to go from having it in the default to requiring multiple flags to 
enable it.
   
   For disallowing HadoopFileIO, we need a different approach than what's done 
in this PR.



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