Fix crash in 1-step integer policy creation

Previously when a retention policy existed on the underlying hypertable,
we would get a segmentation fault when trying to add a Cagg refresh
policy, due to passing a bool instead of pointer to bool argument to
function `ts_jsonb_get_int64_field` in a particular code path.
Fixed by passing the expected pointer type.

Fixes #5907

.unreleased/bugfix_5907

@@ -0,0 +1 @@
+Fixes: #5912 Fix crash in 1-step integer retention policy creation

tsl/src/bgw_policy/policies_v2.c

@@ -128,9 +128,10 @@ validate_and_create_policies(policies_info all_policies, bool if_exists)
 	{
 		if (IS_INTEGER_TYPE(all_policies.partition_type))
 		{
+			bool found_drop_after = false;
 			drop_after_HT = ts_jsonb_get_int64_field(orig_ht_reten_job->fd.config,
 													 POL_RETENTION_CONF_KEY_DROP_AFTER,
-													 false);
+													 &found_drop_after);
 		}
 		else
 		{

tsl/test/expected/cagg_policy.out

@@ -1275,3 +1275,34 @@ SELECT * FROM deals_best_weekly;
  Sun Apr 24 17:00:00 2022 PDT | 117.764705882353 |          6
 (1 row)
 
+-- github issue 5907
+CREATE TABLE t(a integer NOT NULL, b integer);
+SELECT create_hypertable('t', 'a', chunk_time_interval=> 10);
+ create_hypertable 
+-------------------
+ (25,public,t,t)
+(1 row)
+
+CREATE OR REPLACE FUNCTION unix_now() returns int LANGUAGE SQL IMMUTABLE as $$ SELECT extract(epoch from now())::INT $$;
+SELECT set_integer_now_func('t', 'unix_now');
+ set_integer_now_func 
+----------------------
+
+(1 row)
+
+SELECT add_retention_policy('t', 20);
+ add_retention_policy 
+----------------------
+                 1056
+(1 row)
+
+CREATE MATERIALIZED VIEW cagg(a, sumb) WITH (timescaledb.continuous)
+AS SELECT time_bucket(1, a), sum(b)
+   FROM t GROUP BY time_bucket(1, a);
+NOTICE:  continuous aggregate "cagg" is already up-to-date
+SELECT timescaledb_experimental.add_policies('cagg');
+ add_policies 
+--------------
+ f
+(1 row)
+

tsl/test/sql/cagg_policy.sql

@@ -630,3 +630,18 @@ SELECT * FROM deals_best_daily ORDER BY bucket LIMIT 2;
 -- expect to get an up-to-date notice
 CALL refresh_continuous_aggregate('deals_best_weekly', '2022-04-24', '2022-05-05');
 SELECT * FROM deals_best_weekly;
+
+-- github issue 5907
+CREATE TABLE t(a integer NOT NULL, b integer);
+SELECT create_hypertable('t', 'a', chunk_time_interval=> 10);
+
+CREATE OR REPLACE FUNCTION unix_now() returns int LANGUAGE SQL IMMUTABLE as $$ SELECT extract(epoch from now())::INT $$;
+SELECT set_integer_now_func('t', 'unix_now');
+
+SELECT add_retention_policy('t', 20);
+
+CREATE MATERIALIZED VIEW cagg(a, sumb) WITH (timescaledb.continuous)
+AS SELECT time_bucket(1, a), sum(b)
+   FROM t GROUP BY time_bucket(1, a);
+
+SELECT timescaledb_experimental.add_policies('cagg');