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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
id,
description,
json_array_elements(letters)
from
(
values
(1, 'good', '["a","b", "c"]'::json),
(2, 'bad', '[]'::json)
) as aTable(id,description,letters);
| id | description | json_array_elements |
|---|---|---|
| 1 | good | "a" |
| 1 | good | "b" |
| 1 | good | "c" |
SELECT 3