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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
INSERT 0 7
id | name | genres |
---|---|---|
1 | Kraftwerk | ["electronic"] |
2 | Daft Punk | ["electronic", "house"] |
3 | Maroon 5 | ["pop", "rock"] |
4 | One Republic | ["pop", "rock"] |
5 | Lil Nas X | ["hip-hop", "country rap", "rap"] |
6 | Post Malone | ["hip-hop", "rap", "trap"] |
7 | Drake | ["hip-hop", "rap"] |
SELECT 7
genre |
---|
"electronic" |
"electronic" |
"house" |
"pop" |
"rock" |
"pop" |
"rock" |
"hip-hop" |
"country rap" |
"rap" |
"hip-hop" |
"rap" |
"trap" |
"hip-hop" |
"rap" |
SELECT 15
genre | popularity |
---|---|
"rap" | 3 |
"hip-hop" | 3 |
"pop" | 2 |
"rock" | 2 |
"electronic" | 2 |
"house" | 1 |
"country rap" | 1 |
"trap" | 1 |
SELECT 8