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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 15.0 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-10), 64-bit |
SELECT 1
CREATE TABLE test
(
x TEXT NOT NULL
);
CREATE TABLE
INSERT INTO test VALUES ('abc');
INSERT 0 1
SELECT
REGEXP_REPLACE(x, '<something>', '<something_else>', 'g')
FROM test
| regexp_replace |
|---|
| abc |
SELECT 1
SELECT
REGEXP_REPLACE(x, 'a.c', 'A.C')
FROM test;
| regexp_replace |
|---|
| A.C |
SELECT 1
SELECT
UPPER(REGEXP_REPLACE(x, '(.)(.)(.)', '\1')) ||
UPPER(REGEXP_REPLACE(x, '(.)(.)(.)', '\2')) ||
UPPER(REGEXP_REPLACE(x, '(.)(.)(.)', '\3'))
FROM test;
| ?column? |
|---|
| ABC |
SELECT 1