Prepared statement wrong results with default behaviour and partitioning

Problem observed with pure postgres(“PostgreSQL 16.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 11.4.1 20231218 (Red Hat 11.4.1-3), 64-bit”)
, but same is true for hypertables.

drop table test2;

create table test2 

(time timestamptz not null, tag_id bigint, a int, b int, c int, d int, e int, 

f int, g int, h int, i int, j int, k int, l int, m int, n int, o int, 

p int, q int, r int, s int, t int, u int, v int, w int, x int, y int, z int)

partition by range (time)

;

create index on test2 (tag_id, time);

SELECT partman.create_parent( p_parent_table => 'public.test2',

p_control => 'time',

p_interval=> '4h');



insert into test2 (select '2024-06-25T00:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T01:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T02:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T03:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T04:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T05:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T06:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T07:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

insert into test2 (select '2024-06-25T08:00:00Z'::timestamptz + make_interval(mins => i/10000), i%10000, i, i+1, i+2, i+3, i+4, i+5, i+6, i+7, i+8, i+9, i+10, i+11, i+12, i+13, i+14, i+15, i+16, i+17, i+18, i+19, i+20, i+21, i+22, i+23, i+24, i+25 from (select generate_series(0,60*10000-1) as i) a);

CALL partman.run_maintenance_proc();

CALL partman.partition_data_proc('public.test2');

VACUUM ANALYZE public.test2;

prepare tst1(int, date) as

select tst.* from test2 tst

where tst.tag_id = $1 and tst.time = $2

;

explain (analyze, verbose, costs, buffers)

execute tst1(1, '2024-06-25 00:00:00+00') --7 times

;

execute tst1(1, '2024-06-25 12:00:00+00'); -- wrong result

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