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Draft: Prepare async index for ci_pipelines.partition_id related

Tianwen Chen requested to merge 428999-prepare-async-index into master

What does this MR do and why?

Prepare async index for ci_pipelines.partition_id related

As titled, this is the first step of creating indexes asynchronously. See guideline at https://docs.gitlab.com/ee/development/database/adding_database_indexes.html#schedule-the-index-to-be-created

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Before After

How to set up and validate locally

  1. Run the following commands:

    ./scripts/regenerate-schema
RAILS_ENV=test bin/rails runner 'Feature.enable :database_async_index_operations'
RAILS_ENV=test bin/rake gitlab:db:execute_async_index_operations:all

  2. Confirm the following indexes are created in TEST environment

    psql gitlabhq_test -h $PATH_TO_POSTGRESQL/gitlab-development-kit/postgresql
     "index_ci_pipelines_on_id_and_partition_id" UNIQUE, btree (id, partition_id)
 "index_ci_pipelines_on_id_convert_to_bigint_and_partition_id" UNIQUE, btree (id_convert_to_bigint, partition_id)
 "index_ci_pipelines_on_project_id_and_iid_and_partition_id" UNIQUE, btree (project_id, iid, partition_id) WHERE iid IS NOT NULL

  3. Run the following commands to restore the feature flag:

    RAILS_ENV=test bin/rails runner 'Feature.disable :database_async_index_operations'

Related to #428999

Edited by Tianwen Chen

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