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Change follow recommendation materialized view to be faster in most cases (#26545) 

Co-authored-by: Renaud Chaput <renchap@gmail.com>
This commit is contained in:
Claire 2023-08-18 18:20:55 +02:00 committed by GitHub
parent e7bea8f004
commit ee702e36e5
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 65 additions and 10 deletions
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3
app/models/follow_recommendation.rb
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@ -2,7 +2,7 @@
# == Schema Information
#
# Table name: follow_recommendations
# Table name: global_follow_recommendations
#
# account_id :bigint(8) primary key
# rank :decimal(, )
@ -11,6 +11,7 @@
class FollowRecommendation < ApplicationRecord
self.primary_key = :account_id
self.table_name = :global_follow_recommendations
belongs_to :account_summary, foreign_key: :account_id, inverse_of: false
belongs_to :account

8
db/migrate/20230818141056_create_global_follow_recommendations.rb Normal file
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@ -0,0 +1,8 @@
# frozen_string_literal: true
class CreateGlobalFollowRecommendations < ActiveRecord::Migration[7.0]
def change
create_view :global_follow_recommendations, materialized: { no_data: true }
safety_assured { add_index :global_follow_recommendations, :account_id, unique: true }
end
end

12
db/post_migrate/20230818142253_drop_follow_recommendations.rb Normal file
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@ -0,0 +1,12 @@
# frozen_string_literal: true
class DropFollowRecommendations < ActiveRecord::Migration[7.0]
def up
drop_view :follow_recommendations, materialized: true
end
def down
create_view :follow_recommendations, version: 2, materialized: { no_data: true }
safety_assured { add_index :follow_recommendations, :account_id, unique: true }
end
end

20
db/schema.rb
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@ -10,7 +10,7 @@
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema[7.0].define(version: 2023_08_14_223300) do
ActiveRecord::Schema[7.0].define(version: 2023_08_18_142253) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
@ -1331,34 +1331,36 @@ ActiveRecord::Schema[7.0].define(version: 2023_08_14_223300) do
SQL
add_index "account_summaries", ["account_id"], name: "index_account_summaries_on_account_id", unique: true
create_view "follow_recommendations", materialized: true, sql_definition: <<-SQL
create_view "global_follow_recommendations", materialized: true, sql_definition: <<-SQL
SELECT t0.account_id,
sum(t0.rank) AS rank,
array_agg(t0.reason) AS reason
FROM ( SELECT account_summaries.account_id,
((count(follows.id))::numeric / (1.0 + (count(follows.id))::numeric)) AS rank,
'most_followed'::text AS reason
FROM (((follows
FROM ((follows
JOIN account_summaries ON ((account_summaries.account_id = follows.target_account_id)))
JOIN users ON ((users.account_id = follows.account_id)))
LEFT JOIN follow_recommendation_suppressions ON ((follow_recommendation_suppressions.account_id = follows.target_account_id)))
WHERE ((users.current_sign_in_at >= (now() - 'P30D'::interval)) AND (account_summaries.sensitive = false) AND (follow_recommendation_suppressions.id IS NULL))
WHERE ((users.current_sign_in_at >= (now() - 'P30D'::interval)) AND (account_summaries.sensitive = false) AND (NOT (EXISTS ( SELECT 1
FROM follow_recommendation_suppressions
WHERE (follow_recommendation_suppressions.account_id = follows.target_account_id)))))
GROUP BY account_summaries.account_id
HAVING (count(follows.id) >= 5)
UNION ALL
SELECT account_summaries.account_id,
(sum((status_stats.reblogs_count + status_stats.favourites_count)) / (1.0 + sum((status_stats.reblogs_count + status_stats.favourites_count)))) AS rank,
'most_interactions'::text AS reason
FROM (((status_stats
FROM ((status_stats
JOIN statuses ON ((statuses.id = status_stats.status_id)))
JOIN account_summaries ON ((account_summaries.account_id = statuses.account_id)))
LEFT JOIN follow_recommendation_suppressions ON ((follow_recommendation_suppressions.account_id = statuses.account_id)))
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))
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
FROM follow_recommendation_suppressions
WHERE (follow_recommendation_suppressions.account_id = statuses.account_id)))))
GROUP BY account_summaries.account_id
HAVING (sum((status_stats.reblogs_count + status_stats.favourites_count)) >= (5)::numeric)) t0
GROUP BY t0.account_id
ORDER BY (sum(t0.rank)) DESC;
SQL
add_index "follow_recommendations", ["account_id"], name: "index_follow_recommendations_on_account_id", unique: true
add_index "global_follow_recommendations", ["account_id"], name: "index_global_follow_recommendations_on_account_id", unique: true
end

32
db/views/global_follow_recommendations_v01.sql Normal file
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@ -0,0 +1,32 @@
SELECT
account_id,
sum(rank) AS rank,
array_agg(reason) AS reason
FROM (
SELECT
account_summaries.account_id AS account_id,
count(follows.id) / (1.0 + count(follows.id)) AS rank,
'most_followed' AS reason
FROM follows
INNER JOIN account_summaries ON account_summaries.account_id = follows.target_account_id
INNER JOIN users ON users.account_id = follows.account_id
WHERE users.current_sign_in_at >= (now() - interval '30 days')
AND account_summaries.sensitive = 'f'
AND NOT EXISTS (SELECT 1 FROM follow_recommendation_suppressions WHERE follow_recommendation_suppressions.account_id = follows.target_account_id)
GROUP BY account_summaries.account_id
HAVING count(follows.id) >= 5
UNION ALL
SELECT account_summaries.account_id AS account_id,
sum(status_stats.reblogs_count + status_stats.favourites_count) / (1.0 + sum(status_stats.reblogs_count + status_stats.favourites_count)) AS rank,
'most_interactions' AS reason
FROM status_stats
INNER JOIN statuses ON statuses.id = status_stats.status_id
INNER JOIN account_summaries ON account_summaries.account_id = statuses.account_id
WHERE statuses.id >= ((date_part('epoch', now() - interval '30 days') * 1000)::bigint << 16)
AND account_summaries.sensitive = 'f'
AND NOT EXISTS (SELECT 1 FROM follow_recommendation_suppressions WHERE follow_recommendation_suppressions.account_id = statuses.account_id)
GROUP BY account_summaries.account_id
HAVING sum(status_stats.reblogs_count + status_stats.favourites_count) >= 5
) t0
GROUP BY account_id
ORDER BY rank DESC