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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?.
CREATE TABLE t ("(id)" int, "#(txt)" text);
INSERT INTO t VALUES (1,'foo');
SELECT * FROM t;
1 rows affected
| (id) | #(txt) |
|---|---|
| 1 | foo |
UPDATE t SET "#(txt)" = newvalues."#(txt)"
FROM (VALUES (1,'bar')) newvalues ("(id)","#(txt)")
WHERE t."(id)" = newvalues."(id)";
1 rows affected
SELECT * FROM t;
| (id) | #(txt) |
|---|---|
| 1 | bar |