fix schema id cache population

correct splitting of URI into parts

Author: zvonand

src/Storages/ObjectStorage/DataLakes/Iceberg/IcebergMetadata.cpp

@@ -908,7 +908,7 @@ void IcebergMetadata::initializeSchemasFromManifestList(ContextPtr local_context
         for (const auto & manifest_file_entry : manifest_file_ptr->getFiles())
         {
             if (std::holds_alternative<DataFileEntry>(manifest_file_entry.file))
-                schema_id_by_data_file.emplace(std::get<DataFileEntry>(manifest_file_entry.file).file_name, manifest_file_ptr->getSchemaId());
+                schema_id_by_data_file.emplace(Iceberg::makeAbsolutePath(table_location, std::get<DataFileEntry>(manifest_file_entry.file).file_name), manifest_file_ptr->getSchemaId());
         }
     }
 

src/Storages/ObjectStorage/DataLakes/Iceberg/Utils.cpp

@@ -105,11 +105,11 @@ UriParts parseUri(const std::string & uri)
         if (slash == std::string_view::npos)
         {
             parts.authority = std::string(rest);
-            parts.path = "/";
+            parts.path = "/";   // Happy debugging. FIXME: throw exception, path obviously incorrect
             return parts;
         }
         parts.authority = std::string(rest.substr(0, slash));
-        parts.path = std::string(rest.substr(slash)); // keep leading '/'
+        parts.path = std::string(rest.substr(++slash)); // do not keep leading '/'
         return parts;
     }