Use conventional fixture load

rails/rails#29504 implements bulk insert for fixture load.
Oracle database needs another syntax.
In the mean time this commit just falls back to conventional fixture load.

Refer rails/arel#482

lib/active_record/connection_adapters/oracle_enhanced/database_statements.rb

@@ -217,6 +217,13 @@ def insert_fixture(fixture, table_name) #:nodoc:
           end
         end
 
+        # fallback to non bulk fixture insert
+        def insert_fixtures(fixtures, table_name)
+          fixtures.each do |fixture|
+            insert_fixture(fixture, table_name)
+          end
+        end
+
         # Oracle Database does not support this feature
         # Refer https://community.oracle.com/ideas/13845 and consider to vote
         # if you need this feature.