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A comment on Speeding up SQL queries by orders of magnitude using UNION. Parent comment

Re:Speeding up SQL queries by orders of magnitude using UNION by Izkata on Saturday March 20, 2021 @06:06PM (#26526396)
Not sure about each side of the UNION, but postgres can do parallel index scans for even simple criteria: https://www.postgresql.org/docs/10/parallel-plans.html#PARAL...

Also the article says these tests were done on postgres 12.6

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