lemmy/migrations/2020-01-13-025151_create_materialized_views/up.sql

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-- 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 ();