Thread: [GENERAL] Index-only scan on GIN index for COUNT() queries
hi, We have a GIN index on jsonb_col. We always get Bitmap Index Scan + Bitmap Heap Scan when we do things like SELECT COUNT(*) FROM mytable WHERE jsonb_col ? 'key1' Theoretically, could support be added for Index-only scans on GIN indexes when only a COUNT() is requested? Thanks, Seamus PS. Here is the real query analyze: https://gist.github.com/seamusabshere/b9d72132361fa598f7a431fa1bcb120f -- Seamus Abshere, SCEA http://faraday.io https://github.com/seamusabshere http://linkedin.com/in/seamusabshere
On 15.06.2017 17:43, Seamus Abshere wrote: > Theoretically, could support be added for Index-only scans on GIN > indexes when only a COUNT() is requested? Hi Seamus, I am working on a patch that adds this possibility for GIN and any other indexes that support bitmap scans. You can follow the development progress in this thread: https://www.postgresql.org/message-id/flat/ca192322-29fd-9e60-3766-fe5e69d1f9af%40postgrespro.ru#ca192322-29fd-9e60-3766-fe5e69d1f9af@postgrespro.ru -- Alexander Kuzmenkov Postgres Professional: http://www.postgrespro.com The Russian Postgres Company