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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?.
version |
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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
INSERT 0 3
data |
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100.101.198.210 20140107230416 http://news.rambler.ru/6389411 798 503 Safari/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; chromeframe/12.0.742.112)n |
100.101.198.210 20140107230416 http://news.rambler.ru/6389411 798 503 Mozilla/5.0 (Windows NT 6.1; rv:109.0) Gecko/20100101 Firefox/109.0n |
100.101.198.210 20140107230416 http://news.rambler.ru/6389411 798 503 Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0n |
SELECT 3
url | user_agent |
---|---|
http://news.rambler.ru/6389411 | Mozilla/5.0 (Windows NT 6.1; rv:109.0) Gecko/20100101 Firefox/109.0n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0n |
SELECT 2
url | user_agent |
---|---|
http://news.rambler.ru/6389411 | Mozilla/5.0 (Windows NT 6.1; rv:109.0) Gecko/20100101 Firefox/109.0n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0n |
SELECT 2
split_part | split_part |
---|---|
http://news.rambler.ru/6389411 | Safari/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; chromeframe/12.0.742.112)n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (Windows NT 6.1; rv:109.0) Gecko/20100101 Firefox/109.0n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0n |
SELECT 3
url | user_agent |
---|---|
http://news.rambler.ru/6389411 | Safari/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; chromeframe/12.0.742.112)n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (Windows NT 6.1; rv:109.0) Gecko/20100101 Firefox/109.0n |
http://news.rambler.ru/6389411 | Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:82.0) Gecko/20100101 Firefox/82.0n |
SELECT 3