Change follow recommendation materialized view to be faster in most cases (#26545)
Co-authored-by: Renaud Chaput <renchap@gmail.com>main
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@ -2,7 +2,7 @@
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# == Schema Information
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#
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# Table name: follow_recommendations
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# Table name: global_follow_recommendations
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#
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# account_id :bigint(8) primary key
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# rank :decimal(, )
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@ -11,6 +11,7 @@
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class FollowRecommendation < ApplicationRecord
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self.primary_key = :account_id
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self.table_name = :global_follow_recommendations
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belongs_to :account_summary, foreign_key: :account_id, inverse_of: false
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belongs_to :account
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@ -0,0 +1,8 @@
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# frozen_string_literal: true
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class CreateGlobalFollowRecommendations < ActiveRecord::Migration[7.0]
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def change
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create_view :global_follow_recommendations, materialized: { no_data: true }
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safety_assured { add_index :global_follow_recommendations, :account_id, unique: true }
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end
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end
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@ -0,0 +1,12 @@
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# frozen_string_literal: true
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class DropFollowRecommendations < ActiveRecord::Migration[7.0]
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def up
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drop_view :follow_recommendations, materialized: true
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end
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def down
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create_view :follow_recommendations, version: 2, materialized: { no_data: true }
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safety_assured { add_index :follow_recommendations, :account_id, unique: true }
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end
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end
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20
db/schema.rb
20
db/schema.rb
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@ -10,7 +10,7 @@
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#
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# It's strongly recommended that you check this file into your version control system.
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ActiveRecord::Schema[7.0].define(version: 2023_08_14_223300) do
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ActiveRecord::Schema[7.0].define(version: 2023_08_18_142253) do
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# These are extensions that must be enabled in order to support this database
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enable_extension "plpgsql"
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@ -1331,34 +1331,36 @@ ActiveRecord::Schema[7.0].define(version: 2023_08_14_223300) do
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SQL
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add_index "account_summaries", ["account_id"], name: "index_account_summaries_on_account_id", unique: true
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create_view "follow_recommendations", materialized: true, sql_definition: <<-SQL
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create_view "global_follow_recommendations", materialized: true, sql_definition: <<-SQL
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SELECT t0.account_id,
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sum(t0.rank) AS rank,
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array_agg(t0.reason) AS reason
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FROM ( SELECT account_summaries.account_id,
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((count(follows.id))::numeric / (1.0 + (count(follows.id))::numeric)) AS rank,
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'most_followed'::text AS reason
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FROM (((follows
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FROM ((follows
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JOIN account_summaries ON ((account_summaries.account_id = follows.target_account_id)))
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JOIN users ON ((users.account_id = follows.account_id)))
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LEFT JOIN follow_recommendation_suppressions ON ((follow_recommendation_suppressions.account_id = follows.target_account_id)))
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WHERE ((users.current_sign_in_at >= (now() - 'P30D'::interval)) AND (account_summaries.sensitive = false) AND (follow_recommendation_suppressions.id IS NULL))
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WHERE ((users.current_sign_in_at >= (now() - 'P30D'::interval)) AND (account_summaries.sensitive = false) AND (NOT (EXISTS ( SELECT 1
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FROM follow_recommendation_suppressions
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WHERE (follow_recommendation_suppressions.account_id = follows.target_account_id)))))
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GROUP BY account_summaries.account_id
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HAVING (count(follows.id) >= 5)
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UNION ALL
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SELECT account_summaries.account_id,
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(sum((status_stats.reblogs_count + status_stats.favourites_count)) / (1.0 + sum((status_stats.reblogs_count + status_stats.favourites_count)))) AS rank,
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'most_interactions'::text AS reason
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FROM (((status_stats
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FROM ((status_stats
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JOIN statuses ON ((statuses.id = status_stats.status_id)))
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JOIN account_summaries ON ((account_summaries.account_id = statuses.account_id)))
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LEFT JOIN follow_recommendation_suppressions ON ((follow_recommendation_suppressions.account_id = statuses.account_id)))
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WHERE ((statuses.id >= (((date_part('epoch'::text, (now() - 'P30D'::interval)) * (1000)::double precision))::bigint << 16)) AND (account_summaries.sensitive = false) AND (follow_recommendation_suppressions.id IS NULL))
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WHERE ((statuses.id >= (((date_part('epoch'::text, (now() - 'P30D'::interval)) * (1000)::double precision))::bigint << 16)) AND (account_summaries.sensitive = false) AND (NOT (EXISTS ( SELECT 1
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FROM follow_recommendation_suppressions
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WHERE (follow_recommendation_suppressions.account_id = statuses.account_id)))))
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GROUP BY account_summaries.account_id
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HAVING (sum((status_stats.reblogs_count + status_stats.favourites_count)) >= (5)::numeric)) t0
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GROUP BY t0.account_id
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ORDER BY (sum(t0.rank)) DESC;
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SQL
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add_index "follow_recommendations", ["account_id"], name: "index_follow_recommendations_on_account_id", unique: true
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add_index "global_follow_recommendations", ["account_id"], name: "index_global_follow_recommendations_on_account_id", unique: true
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end
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@ -0,0 +1,32 @@
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SELECT
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account_id,
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sum(rank) AS rank,
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array_agg(reason) AS reason
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FROM (
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SELECT
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account_summaries.account_id AS account_id,
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count(follows.id) / (1.0 + count(follows.id)) AS rank,
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'most_followed' AS reason
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FROM follows
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INNER JOIN account_summaries ON account_summaries.account_id = follows.target_account_id
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INNER JOIN users ON users.account_id = follows.account_id
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WHERE users.current_sign_in_at >= (now() - interval '30 days')
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AND account_summaries.sensitive = 'f'
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AND NOT EXISTS (SELECT 1 FROM follow_recommendation_suppressions WHERE follow_recommendation_suppressions.account_id = follows.target_account_id)
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GROUP BY account_summaries.account_id
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HAVING count(follows.id) >= 5
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UNION ALL
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SELECT account_summaries.account_id AS account_id,
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sum(status_stats.reblogs_count + status_stats.favourites_count) / (1.0 + sum(status_stats.reblogs_count + status_stats.favourites_count)) AS rank,
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'most_interactions' AS reason
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FROM status_stats
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INNER JOIN statuses ON statuses.id = status_stats.status_id
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INNER JOIN account_summaries ON account_summaries.account_id = statuses.account_id
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WHERE statuses.id >= ((date_part('epoch', now() - interval '30 days') * 1000)::bigint << 16)
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AND account_summaries.sensitive = 'f'
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AND NOT EXISTS (SELECT 1 FROM follow_recommendation_suppressions WHERE follow_recommendation_suppressions.account_id = statuses.account_id)
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GROUP BY account_summaries.account_id
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HAVING sum(status_stats.reblogs_count + status_stats.favourites_count) >= 5
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) t0
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GROUP BY account_id
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ORDER BY rank DESC
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