By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0.
Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
ERROR: 2019-06-01 CONTEXT: PL/pgSQL function inline_code_block line 9 at RAISE
ERROR: 2019-06-01 CONTEXT: PL/pgSQL function inline_code_block line 8 at RAISE