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Resolve "ActiveRecord::QueryCanceled: PG::QueryCanceled: ERROR: canceling statement due to statement timeout"

Manoj M J requested to merge 371703-activerecord-querycanceled-pg-querycanceled-error-canceling-statement-due-to-statement into master

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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Edited by Manoj M J

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