Merge pull request #24576 from yahonda/quote_column_name_for_reserved_word_size

Address ORA-00923 error by quoting a reserved word "SIZE"

activerecord/lib/active_record/collection_cache_key.rb

@@ -16,7 +16,7 @@ def collection_cache_key(collection = all, timestamp_column = :updated_at) # :no
 
         query = collection
           .unscope(:select)
-          .select("COUNT(*) AS size", "MAX(#{column}) AS timestamp")
+          .select("COUNT(*) AS #{connection.quote_column_name("size")}", "MAX(#{column}) AS timestamp")
           .unscope(:order)
         result = connection.select_one(query)