create table t_t1 (a1 int);
create or replace view v_t1 as select * from t_t1;
select pg_get_viewdef('v_t1'::regclass);
 pg_get_viewdef
-----------------
  SELECT t_t1.a1+
    FROM t_t1;
alter table t_t1 rename to t_t2;
select pg_get_viewdef('v_t1'::regclass);
 pg_get_viewdef
-----------------
  SELECT t_t2.a1+
    FROM t_t2;
drop table t_t2 cascade;