public Iterable<FallbackKey> fallbackKeys() {
        return (fallbackKeys == EMPTY) ? Collections.emptyList() : Arrays.asList(fallbackKeys);
    }
Gets the fallback keys, in the order to be checked.

@return The option's fallback keys.
inlong-sort/sort-common/src/main/java/org/apache/inlong/sort/configuration/ConfigOption.java