flyingImer commented on code in PR #4506:
URL: https://github.com/apache/polaris/pull/4506#discussion_r3283035570


##########
runtime/service/src/main/java/org/apache/polaris/service/catalog/iceberg/IcebergCatalog.java:
##########
@@ -332,11 +367,67 @@ public Table registerTable(TableIdentifier identifier, 
String metadataFileLocati
 
     InputFile metadataFile = fileIO.newInputFile(metadataFileLocation);
     TableMetadata metadata = TableMetadataParser.read(metadataFile);
+    validateMetadataFileInTableDir(identifier, metadata);
     ops.commit(null, metadata);
 
     return new BaseTable(ops, fullTableName(name(), identifier), 
metricsReporter());
   }
 
+  private Table overwriteRegisteredTable(
+      TableIdentifier identifier, String metadataFileLocation, String 
locationDir) {
+    PolarisResolvedPathWrapper resolvedPath =
+        resolvedEntityView.getPassthroughResolvedPath(
+            ResolvedPathKey.ofTableLike(identifier), 
PolarisEntitySubType.ANY_SUBTYPE);
+    if (resolvedPath == null || resolvedPath.getRawLeafEntity() == null) {
+      throw new NoSuchTableException("Table does not exist: %s", identifier);
+    }
+
+    validateLocationForTableLike(identifier, metadataFileLocation, 
resolvedPath);
+
+    FileIO fileIO =
+        loadFileIOForTableLike(
+            identifier,
+            Set.of(locationDir),
+            resolvedPath,
+            new HashMap<>(tableDefaultProperties),
+            Set.of(PolarisStorageActions.READ, PolarisStorageActions.LIST));
+
+    TableMetadata metadata = TableMetadataParser.read(fileIO, 
metadataFileLocation);
+    validateMetadataFileInTableDir(identifier, metadata);
+
+    List<PolarisEntity> resolvedNamespace = resolvedPath.getRawParentPath();
+    var tableLocations = StorageUtil.getLocationsUsedByTable(metadata);
+    CatalogUtils.validateLocationsForTableLike(
+        realmConfig, identifier, tableLocations, resolvedPath);
+    tableLocations.forEach(
+        location ->
+            validateNoLocationOverlap(
+                catalogEntity,
+                identifier,
+                resolvedNamespace,
+                location,
+                resolvedPath.getRawLeafEntity()));
+
+    PolarisEntity rawEntity = resolvedPath.getRawLeafEntity();
+    if (rawEntity.getSubType() != PolarisEntitySubType.ICEBERG_TABLE) {
+      throw alreadyExistsExceptionForTableLikeEntity(identifier, 
rawEntity.getSubType());
+    }
+
+    IcebergTableLikeEntity existingEntity = 
IcebergTableLikeEntity.of(rawEntity);
+
+    Map<String, String> storedProperties = 
buildTableMetadataPropertiesMap(metadata);
+    IcebergTableLikeEntity updatedEntity =
+        new IcebergTableLikeEntity.Builder(existingEntity)
+            .setInternalProperties(storedProperties)
+            .setMetadataLocation(metadataFileLocation)

Review Comment:
   The overwrite path updates metadata-location and internal properties but 
doesn't call `.setBaseLocation(metadata.location())` — so if the new metadata 
points at a different table location, the entity's stored base drifts. The 
normal commit path (line ~1612) does update it. Overlap checks and 
credential-vending scope depend on this being current.



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