presto-main/src/main/java/io/prestosql/sql/planner/iterative/rule/PushRemoteExchangeThroughAssignUniqueId.java/PushRemoteExchangeThroughAssignUniqueId/getPattern
class PushRemoteExchangeThroughAssignUniqueId:    @Override
    public Pattern<ExchangeNode> getPattern()
    {
        return PATTERN;
    }