CREATE TABLE int_tab (a integer, b integer, c integer);
SELECT table_name FROM create_hypertable('int_tab', 'a', chunk_time_interval=> 10);

INSERT INTO int_tab VALUES( 3 , 16 , 20);
INSERT INTO int_tab VALUES( 1 , 10 , 20);
INSERT INTO int_tab VALUES( 1 , 11 , 20);
INSERT INTO int_tab VALUES( 1 , 12 , 20);
INSERT INTO int_tab VALUES( 1 , 13 , 20);
INSERT INTO int_tab VALUES( 1 , 14 , 20);
INSERT INTO int_tab VALUES( 2 , 14 , 20);
INSERT INTO int_tab VALUES( 2 , 15 , 20);
INSERT INTO int_tab VALUES( 2 , 16 , 20);

CREATE OR REPLACE FUNCTION integer_now_int_tab() returns int LANGUAGE SQL STABLE as $$ SELECT coalesce(max(a), 0) FROM int_tab $$; 
SELECT set_integer_now_func('int_tab', 'integer_now_int_tab');

CREATE MATERIALIZED VIEW mat_m1( a, countb )
WITH (timescaledb.continuous, timescaledb.materialized_only=true)
as
SELECT a, count(b)
FROM int_tab
GROUP BY time_bucket(1, a), a WITH NO DATA;

SELECT add_continuous_aggregate_policy('mat_m1', start_offset =>10, end_offset =>null, schedule_interval =>'1h'::interval, if_not_exists=>true);

SELECT add_continuous_aggregate_policy('mat_m1', start_offset =>10, end_offset =>null, schedule_interval =>'1h'::interval, if_not_exists=>true);