Postgres 16

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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.

select version();

version

PostgreSQL 16.0 (Debian 16.0-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit

SELECT 1

CREATE TABLE test (ts, te) 
AS VALUES ('2023-10-25 14:33:00'::TIMESTAMPTZ, '2023-10-25 15:56:00'::TIMESTAMPTZ);

SELECT 1

--
INSERT INTO test VALUES ('2023-10-25 14:33:00', '2023-10-25 15:56:00');  
-- Coercion - great!
--

INSERT 0 1

SELECT * FROM test;

ts
te

2023-10-25 14:33:00+00
2023-10-25 15:56:00+00

2023-10-25 14:33:00+00
2023-10-25 15:56:00+00

SELECT 2

SELECT (ts, te)::TSTZRANGE FROM test;

ERROR:  cannot cast type record to tstzrange
LINE 1: SELECT (ts, te)::TSTZRANGE FROM test;
                       ^

SELECT TSTZRANGE(ts, te) FROM test;

tstzrange

["2023-10-25 14:33:00+00","2023-10-25 15:56:00+00")

["2023-10-25 14:33:00+00","2023-10-25 15:56:00+00")

SELECT 2

ts	te
2023-10-25 14:33:00+00	2023-10-25 15:56:00+00
2023-10-25 14:33:00+00	2023-10-25 15:56:00+00