Resolve "ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR: canceling statement due to statement timeout"
What does this MR do and why?
Related to #371703 (closed)
This change originates from the work in !93633 (merged).
We have to apply a force SELECT(*) before the pagination logic kicks in. More details are added as comments in the diff.
Query performance
Performance of the COUNT query originating from Kaminari:
Before: https://postgres.ai/console/gitlab/gitlab-production-tunnel-pg12/sessions/12163/commands/43164 - 18.5 minutes!
After: https://postgres.ai/console/gitlab/gitlab-production-tunnel-pg12/sessions/12163/commands/43163 - ~686 ms.
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