A first pass at using materialized views.

2 files changed, 660 insertions, 0 deletions

diff --git a/server/migrations/2020-01-13-025151_create_materialized_views/down.sql b/server/migrations/2020-01-13-025151_create_materialized_views/down.sql
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+-- functions and triggers
+drop trigger refresh_user on user_;
+drop function refresh_user();
+drop trigger refresh_post on post;
+drop function refresh_post();
+drop trigger refresh_post_like on post_like;
+drop function refresh_post_like();
+drop trigger refresh_community on community;
+drop function refresh_community();
+drop trigger refresh_community_follower on community_follower;
+drop function refresh_community_follower();
+drop trigger refresh_community_user_ban on community_user_ban;
+drop function refresh_community_user_ban();
+drop trigger refresh_comment on comment;
+drop function refresh_comment();
+drop trigger refresh_comment_like on comment_like;
+drop function refresh_comment_like();
+
+-- post
+-- Recreate the view
+drop view post_view;
+create view post_view as
+with all_post as
+(
+  select        
+  p.*,
+  (select u.banned from user_ u where p.creator_id = u.id) as banned,
+  (select cb.id::bool from community_user_ban cb where p.creator_id = cb.user_id and p.community_id = cb.community_id) as banned_from_community,
+  (select name from user_ where p.creator_id = user_.id) as creator_name,
+  (select avatar from user_ where p.creator_id = user_.id) as creator_avatar,
+  (select name from community where p.community_id = community.id) as community_name,
+  (select removed from community c where p.community_id = c.id) as community_removed,
+  (select deleted from community c where p.community_id = c.id) as community_deleted,
+  (select nsfw from community c where p.community_id = c.id) as community_nsfw,
+  (select count(*) from comment where comment.post_id = p.id) as number_of_comments,
+  coalesce(sum(pl.score), 0) as score,
+  count (case when pl.score = 1 then 1 else null end) as upvotes,
+  count (case when pl.score = -1 then 1 else null end) as downvotes,
+  hot_rank(coalesce(sum(pl.score) , 0), p.published) as hot_rank
+  from post p
+  left join post_like pl on p.id = pl.post_id
+  group by p.id
+)
+
+select
+ap.*,
+u.id as user_id,
+coalesce(pl.score, 0) as my_vote,
+(select cf.id::bool from community_follower cf where u.id = cf.user_id and cf.community_id = ap.community_id) as subscribed,
+(select pr.id::bool from post_read pr where u.id = pr.user_id and pr.post_id = ap.id) as read,
+(select ps.id::bool from post_saved ps where u.id = ps.user_id and ps.post_id = ap.id) as saved
+from user_ u
+cross join all_post ap
+left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
+
+union all
+
+select 
+ap.*,
+null as user_id,
+null as my_vote,
+null as subscribed,
+null as read,
+null as saved
+from all_post ap
+;
+
+drop view post_mview;
+drop materialized view post_aggregates_mview;
+drop view post_aggregates_view;
+
+-- user
+drop materialized view user_mview;
+drop view user_view;
+create view user_view as 
+select id,
+name,
+avatar,
+email,
+fedi_name,
+admin,
+banned,
+show_avatars,
+send_notifications_to_email,
+published,
+(select count(*) from post p where p.creator_id = u.id) as number_of_posts,
+(select coalesce(sum(score), 0) from post p, post_like pl where u.id = p.creator_id and p.id = pl.post_id) as post_score,
+(select count(*) from comment c where c.creator_id = u.id) as number_of_comments,
+(select coalesce(sum(score), 0) from comment c, comment_like cl where u.id = c.creator_id and c.id = cl.comment_id) as comment_score
+from user_ u;
+
+-- community
+drop view community_mview;
+drop materialized view community_aggregates_mview;
+drop view community_view;
+drop view community_aggregates_view;
+create view community_view as 
+with all_community as
+(
+  select *,
+  (select name from user_ u where c.creator_id = u.id) as creator_name,
+  (select avatar from user_ u where c.creator_id = u.id) as creator_avatar,
+  (select name from category ct where c.category_id = ct.id) as category_name,
+  (select count(*) from community_follower cf where cf.community_id = c.id) as number_of_subscribers,
+  (select count(*) from post p where p.community_id = c.id) as number_of_posts,
+  (select count(*) from comment co, post p where c.id = p.community_id and p.id = co.post_id) as number_of_comments,
+  hot_rank((select count(*) from community_follower cf where cf.community_id = c.id), c.published) as hot_rank
+  from community c
+)
+
+select
+ac.*,
+u.id as user_id,
+(select cf.id::boolean from community_follower cf where u.id = cf.user_id and ac.id = cf.community_id) as subscribed
+from user_ u
+cross join all_community ac
+
+union all
+
+select 
+ac.*,
+null as user_id,
+null as subscribed
+from all_community ac
+;
+
+-- reply and comment view
+drop view reply_view;
+drop view user_mention_view;
+drop view comment_view;
+drop view comment_mview;
+drop materialized view comment_aggregates_mview;
+drop view comment_aggregates_view;
+create view comment_view as
+with all_comment as
+(
+  select        
+  c.*,
+  (select community_id from post p where p.id = c.post_id),
+  (select u.banned from user_ u where c.creator_id = u.id) as banned,
+  (select cb.id::bool from community_user_ban cb, post p where c.creator_id = cb.user_id and p.id = c.post_id and p.community_id = cb.community_id) as banned_from_community,
+  (select name from user_ where c.creator_id = user_.id) as creator_name,
+  (select avatar from user_ where c.creator_id = user_.id) as creator_avatar,
+  coalesce(sum(cl.score), 0) as score,
+  count (case when cl.score = 1 then 1 else null end) as upvotes,
+  count (case when cl.score = -1 then 1 else null end) as downvotes
+  from comment c
+  left join comment_like cl on c.id = cl.comment_id
+  group by c.id
+)
+
+select
+ac.*,
+u.id as user_id,
+coalesce(cl.score, 0) as my_vote,
+(select cs.id::bool from comment_saved cs where u.id = cs.user_id and cs.comment_id = ac.id) as saved
+from user_ u
+cross join all_comment ac
+left join comment_like cl on u.id = cl.user_id and ac.id = cl.comment_id
+
+union all
+
+select 
+    ac.*,
+    null as user_id, 
+    null as my_vote,
+    null as saved
+from all_comment ac
+;
+
+create view reply_view as 
+with closereply as (
+    select 
+    c2.id, 
+    c2.creator_id as sender_id, 
+    c.creator_id as recipient_id
+    from comment c
+    inner join comment c2 on c.id = c2.parent_id
+    where c2.creator_id != c.creator_id
+    -- Do union where post is null
+    union
+    select
+    c.id,
+    c.creator_id as sender_id,
+    p.creator_id as recipient_id
+    from comment c, post p
+    where c.post_id = p.id and c.parent_id is null and c.creator_id != p.creator_id
+)
+select cv.*,
+closereply.recipient_id
+from comment_view cv, closereply
+where closereply.id = cv.id
+;
+
+-- user mention
+create view user_mention_view as
+select 
+    c.id,
+    um.id as user_mention_id,
+    c.creator_id,
+    c.post_id,
+    c.parent_id,
+    c.content,
+    c.removed,
+    um.read,
+    c.published,
+    c.updated,
+    c.deleted,
+    c.community_id,
+    c.banned,
+    c.banned_from_community,
+    c.creator_name,
+    c.creator_avatar,
+    c.score,
+    c.upvotes,
+    c.downvotes,
+    c.user_id,
+    c.my_vote,
+    c.saved,
+    um.recipient_id
+from user_mention um, comment_view c
+where um.comment_id = c.id;
+
diff --git a/server/migrations/2020-01-13-025151_create_materialized_views/up.sql b/server/migrations/2020-01-13-025151_create_materialized_views/up.sql
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+++ b/server/migrations/2020-01-13-025151_create_materialized_views/up.sql
@@ -0,0 +1,437 @@
+-- post
+create view post_aggregates_view as
+select        
+p.*,
+(select u.banned from user_ u where p.creator_id = u.id) as banned,
+(select cb.id::bool from community_user_ban cb where p.creator_id = cb.user_id and p.community_id = cb.community_id) as banned_from_community,
+(select name from user_ where p.creator_id = user_.id) as creator_name,
+(select avatar from user_ where p.creator_id = user_.id) as creator_avatar,
+(select name from community where p.community_id = community.id) as community_name,
+(select removed from community c where p.community_id = c.id) as community_removed,
+(select deleted from community c where p.community_id = c.id) as community_deleted,
+(select nsfw from community c where p.community_id = c.id) as community_nsfw,
+(select count(*) from comment where comment.post_id = p.id) as number_of_comments,
+coalesce(sum(pl.score), 0) as score,
+count (case when pl.score = 1 then 1 else null end) as upvotes,
+count (case when pl.score = -1 then 1 else null end) as downvotes,
+hot_rank(coalesce(sum(pl.score) , 0), p.published) as hot_rank
+from post p
+left join post_like pl on p.id = pl.post_id
+group by p.id;
+
+create materialized view post_aggregates_mview as select * from post_aggregates_view;
+
+create unique index idx_post_aggregates_mview_id on post_aggregates_mview (id);
+
+drop view post_view;
+create view post_view as 
+with all_post as (
+  select
+  pa.*
+  from post_aggregates_view pa
+)
+select
+ap.*,
+u.id as user_id,
+coalesce(pl.score, 0) as my_vote,
+(select cf.id::bool from community_follower cf where u.id = cf.user_id and cf.community_id = ap.community_id) as subscribed,
+(select pr.id::bool from post_read pr where u.id = pr.user_id and pr.post_id = ap.id) as read,
+(select ps.id::bool from post_saved ps where u.id = ps.user_id and ps.post_id = ap.id) as saved
+from user_ u
+cross join all_post ap
+left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
+
+union all
+
+select 
+ap.*,
+null as user_id,
+null as my_vote,
+null as subscribed,
+null as read,
+null as saved
+from all_post ap
+;
+
+create view post_mview as 
+with all_post as (
+  select
+  pa.*
+  from post_aggregates_mview pa
+)
+select
+ap.*,
+u.id as user_id,
+coalesce(pl.score, 0) as my_vote,
+(select cf.id::bool from community_follower cf where u.id = cf.user_id and cf.community_id = ap.community_id) as subscribed,
+(select pr.id::bool from post_read pr where u.id = pr.user_id and pr.post_id = ap.id) as read,
+(select ps.id::bool from post_saved ps where u.id = ps.user_id and ps.post_id = ap.id) as saved
+from user_ u
+cross join all_post ap
+left join post_like pl on u.id = pl.user_id and ap.id = pl.post_id
+
+union all
+
+select 
+ap.*,
+null as user_id,
+null as my_vote,
+null as subscribed,
+null as read,
+null as saved
+from all_post ap
+;
+
+
+-- user_view
+drop view user_view;
+create view user_view as 
+select 
+u.id,
+u.name,
+u.avatar,
+u.email,
+u.fedi_name,
+u.admin,
+u.banned,
+u.show_avatars,
+u.send_notifications_to_email,
+u.published,
+(select count(*) from post p where p.creator_id = u.id) as number_of_posts,
+(select coalesce(sum(score), 0) from post p, post_like pl where u.id = p.creator_id and p.id = pl.post_id) as post_score,
+(select count(*) from comment c where c.creator_id = u.id) as number_of_comments,
+(select coalesce(sum(score), 0) from comment c, comment_like cl where u.id = c.creator_id and c.id = cl.comment_id) as comment_score
+from user_ u;
+
+create materialized view user_mview as select * from user_view;
+
+create unique index idx_user_mview_id on user_mview (id);
+
+-- community
+create view community_aggregates_view as
+select c.*,
+(select name from user_ u where c.creator_id = u.id) as creator_name,
+(select avatar from user_ u where c.creator_id = u.id) as creator_avatar,
+(select name from category ct where c.category_id = ct.id) as category_name,
+(select count(*) from community_follower cf where cf.community_id = c.id) as number_of_subscribers,
+(select count(*) from post p where p.community_id = c.id) as number_of_posts,
+(select count(*) from comment co, post p where c.id = p.community_id and p.id = co.post_id) as number_of_comments,
+hot_rank((select count(*) from community_follower cf where cf.community_id = c.id), c.published) as hot_rank
+from community c;
+
+create materialized view community_aggregates_mview as select * from community_aggregates_view;
+
+create unique index idx_community_aggregates_mview_id on community_aggregates_mview (id);
+
+drop view community_view;
+create view community_view as
+with all_community as
+(
+  select
+  ca.*
+  from community_aggregates_view ca
+)
+
+select
+ac.*,
+u.id as user_id,
+(select cf.id::boolean from community_follower cf where u.id = cf.user_id and ac.id = cf.community_id) as subscribed
+from user_ u
+cross join all_community ac
+
+union all
+
+select 
+ac.*,
+null as user_id,
+null as subscribed
+from all_community ac
+;
+
+create view community_mview as
+with all_community as
+(
+  select
+  ca.*
+  from community_aggregates_mview ca
+)
+
+select
+ac.*,
+u.id as user_id,
+(select cf.id::boolean from community_follower cf where u.id = cf.user_id and ac.id = cf.community_id) as subscribed
+from user_ u
+cross join all_community ac
+
+union all
+
+select 
+ac.*,
+null as user_id,
+null as subscribed
+from all_community ac
+;
+
+
+-- reply and comment view
+create view comment_aggregates_view as
+select        
+c.*,
+(select community_id from post p where p.id = c.post_id),
+(select u.banned from user_ u where c.creator_id = u.id) as banned,
+(select cb.id::bool from community_user_ban cb, post p where c.creator_id = cb.user_id and p.id = c.post_id and p.community_id = cb.community_id) as banned_from_community,
+(select name from user_ where c.creator_id = user_.id) as creator_name,
+(select avatar from user_ where c.creator_id = user_.id) as creator_avatar,
+coalesce(sum(cl.score), 0) as score,
+count (case when cl.score = 1 then 1 else null end) as upvotes,
+count (case when cl.score = -1 then 1 else null end) as downvotes
+from comment c
+left join comment_like cl on c.id = cl.comment_id
+group by c.id;
+
+create materialized view comment_aggregates_mview as select * from comment_aggregates_view;
+
+create unique index idx_comment_aggregates_mview_id on comment_aggregates_mview (id);
+
+drop view reply_view;
+drop view user_mention_view;
+drop view comment_view;
+
+create view comment_view as
+with all_comment as
+(
+  select
+  ca.*
+  from comment_aggregates_view ca
+)
+
+select
+ac.*,
+u.id as user_id,
+coalesce(cl.score, 0) as my_vote,
+(select cs.id::bool from comment_saved cs where u.id = cs.user_id and cs.comment_id = ac.id) as saved
+from user_ u
+cross join all_comment ac
+left join comment_like cl on u.id = cl.user_id and ac.id = cl.comment_id
+
+union all
+
+select 
+    ac.*,
+    null as user_id, 
+    null as my_vote,
+    null as saved
+from all_comment ac
+;
+
+create view comment_mview as
+with all_comment as
+(
+  select
+  ca.*
+  from comment_aggregates_mview ca
+)
+
+select
+ac.*,
+u.id as user_id,
+coalesce(cl.score, 0) as my_vote,
+(select cs.id::bool from comment_saved cs where u.id = cs.user_id and cs.comment_id = ac.id) as saved
+from user_ u
+cross join all_comment ac
+left join comment_like cl on u.id = cl.user_id and ac.id = cl.comment_id
+
+union all
+
+select 
+    ac.*,
+    null as user_id, 
+    null as my_vote,
+    null as saved
+from all_comment ac
+;
+
+create view reply_view as 
+with closereply as (
+    select 
+    c2.id, 
+    c2.creator_id as sender_id, 
+    c.creator_id as recipient_id
+    from comment c
+    inner join comment c2 on c.id = c2.parent_id
+    where c2.creator_id != c.creator_id
+    -- Do union where post is null
+    union
+    select
+    c.id,
+    c.creator_id as sender_id,
+    p.creator_id as recipient_id
+    from comment c, post p
+    where c.post_id = p.id and c.parent_id is null and c.creator_id != p.creator_id
+)
+select cv.*,
+closereply.recipient_id
+from comment_view cv, closereply
+where closereply.id = cv.id
+;
+
+-- user mention
+create view user_mention_view as
+select 
+    c.id,
+    um.id as user_mention_id,
+    c.creator_id,
+    c.post_id,
+    c.parent_id,
+    c.content,
+    c.removed,
+    um.read,
+    c.published,
+    c.updated,
+    c.deleted,
+    c.community_id,
+    c.banned,
+    c.banned_from_community,
+    c.creator_name,
+    c.creator_avatar,
+    c.score,
+    c.upvotes,
+    c.downvotes,
+    c.user_id,
+    c.my_vote,
+    c.saved,
+    um.recipient_id
+from user_mention um, comment_view c
+where um.comment_id = c.id;
+
+-- user
+create or replace function refresh_user()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently user_mview;
+  refresh materialized view concurrently comment_aggregates_mview; -- cause of bans
+  refresh materialized view concurrently post_aggregates_mview;
+  return null;
+end $$;
+
+create trigger refresh_user
+after insert or update or delete or truncate
+on user_
+for each statement
+execute procedure refresh_user();
+
+-- post
+create or replace function refresh_post()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently post_aggregates_mview;
+  refresh materialized view concurrently user_mview;
+  return null;
+end $$;
+
+create trigger refresh_post
+after insert or update or delete or truncate
+on post
+for each statement
+execute procedure refresh_post();
+
+-- post_like
+create or replace function refresh_post_like()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently post_aggregates_mview;
+  refresh materialized view concurrently user_mview; 
+  return null;
+end $$;
+
+create trigger refresh_post_like
+after insert or update or delete or truncate
+on post_like
+for each statement
+execute procedure refresh_post_like();
+
+-- community
+create or replace function refresh_community()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently post_aggregates_mview;
+  refresh materialized view concurrently community_aggregates_mview; 
+  refresh materialized view concurrently user_mview;
+  return null;
+end $$;
+
+create trigger refresh_community
+after insert or update or delete or truncate
+on community
+for each statement
+execute procedure refresh_community();
+
+-- community_follower
+create or replace function refresh_community_follower()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently community_aggregates_mview;
+  refresh materialized view concurrently post_aggregates_mview;
+  return null;
+end $$;
+
+create trigger refresh_community_follower
+after insert or update or delete or truncate
+on community_follower
+for each statement
+execute procedure refresh_community_follower();
+
+-- community_user_ban
+create or replace function refresh_community_user_ban()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently comment_aggregates_mview;
+  refresh materialized view concurrently post_aggregates_mview;
+  return null;
+end $$;
+
+create trigger refresh_community_user_ban
+after insert or update or delete or truncate
+on community_user_ban
+for each statement
+execute procedure refresh_community_user_ban();
+
+-- comment
+create or replace function refresh_comment()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently post_aggregates_mview;
+  refresh materialized view concurrently comment_aggregates_mview; 
+  refresh materialized view concurrently community_aggregates_mview; 
+  refresh materialized view concurrently user_mview; 
+  return null;
+end $$;
+
+create trigger refresh_comment
+after insert or update or delete or truncate
+on comment
+for each statement
+execute procedure refresh_comment();
+
+-- comment_like
+create or replace function refresh_comment_like()
+returns trigger language plpgsql
+as $$
+begin
+  refresh materialized view concurrently comment_aggregates_mview;
+  refresh materialized view concurrently user_mview;
+  return null;
+end $$;
+
+create trigger refresh_comment_like
+after insert or update or delete or truncate
+on comment_like
+for each statement
+execute procedure refresh_comment_like();