mirrors/lemmy
1
0
Fork 0
mirror of https://github.com/LemmyNet/lemmy.git synced 2024-06-01 00:28:05 +00:00
Code Issues Projects Releases Wiki Activity

Denormalize community_id into post_aggregates for a 1000x speed-up when loading posts (#3653)

Browse source 
* Denormalize community_id into post_aggregates for a 1000x speed-up when loading posts

* Remove unused index

* Add creator_id to post_aggregates

* Use post_aggregates as main table for PostQuery

* Make post_aggregates the main table for PostView

* Reformat SQL
This commit is contained in:
Sander Saarend 2023-07-20 18:13:21 +03:00 committed by GitHub
parent ced3aa5bd8
commit b511c2e6cb
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
6 changed files with 89 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
crates/db_schema/src/aggregates/structs.rs
View file

@ -96,6 +96,8 @@ pub struct PostAggregates {
pub featured_local: bool,
pub hot_rank: i32,
pub hot_rank_active: i32,
pub community_id: CommunityId,
pub creator_id: PersonId,
}
#[derive(PartialEq, Eq, Debug, Serialize, Deserialize, Clone)]

4
crates/db_schema/src/schema.rs
View file

@ -672,6 +672,8 @@ diesel::table! {
featured_local -> Bool,
hot_rank -> Int4,
hot_rank_active -> Int4,
community_id -> Int4,
creator_id -> Int4,
}
}
@ -908,6 +910,8 @@ diesel::joinable!(person_post_aggregates -> post (post_id));
diesel::joinable!(post -> community (community_id));
diesel::joinable!(post -> language (language_id));
diesel::joinable!(post -> person (creator_id));
diesel::joinable!(post_aggregates -> community (community_id));
diesel::joinable!(post_aggregates -> person (creator_id));
diesel::joinable!(post_aggregates -> post (post_id));
diesel::joinable!(post_like -> person (person_id));
diesel::joinable!(post_like -> post (post_id));

2
crates/db_views/src/post_report_view.rs
View file

@ -470,6 +470,8 @@ mod tests {
featured_local: false,
hot_rank: 1728,
hot_rank_active: 1728,
community_id: inserted_post.community_id,
creator_id: inserted_post.creator_id,
},
resolver: None,
};

50
crates/db_views/src/post_view.rs
View file

@ -72,56 +72,56 @@ impl PostView {
// The left join below will return None in this case
let person_id_join = my_person_id.unwrap_or(PersonId(-1));
let mut query = post::table
.find(post_id)
let mut query = post_aggregates::table
.filter(post_aggregates::post_id.eq(post_id))
.inner_join(person::table)
.inner_join(community::table)
.left_join(
community_person_ban::table.on(
post::community_id
post_aggregates::community_id
.eq(community_person_ban::community_id)
.and(community_person_ban::person_id.eq(post::creator_id)),
.and(community_person_ban::person_id.eq(post_aggregates::creator_id)),
),
)
.inner_join(post_aggregates::table)
.inner_join(post::table)
.left_join(
community_follower::table.on(
post::community_id
post_aggregates::community_id
.eq(community_follower::community_id)
.and(community_follower::person_id.eq(person_id_join)),
),
)
.left_join(
post_saved::table.on(
post::id
post_aggregates::post_id
.eq(post_saved::post_id)
.and(post_saved::person_id.eq(person_id_join)),
),
)
.left_join(
post_read::table.on(
post::id
post_aggregates::post_id
.eq(post_read::post_id)
.and(post_read::person_id.eq(person_id_join)),
),
)
.left_join(
person_block::table.on(
post::creator_id
post_aggregates::creator_id
.eq(person_block::target_id)
.and(person_block::person_id.eq(person_id_join)),
),
)
.left_join(
post_like::table.on(
post::id
post_aggregates::post_id
.eq(post_like::post_id)
.and(post_like::person_id.eq(person_id_join)),
),
)
.left_join(
person_post_aggregates::table.on(
post::id
post_aggregates::post_id
.eq(person_post_aggregates::post_id)
.and(person_post_aggregates::person_id.eq(person_id_join)),
),
@ -226,62 +226,62 @@ impl<'a> PostQuery<'a> {
.map(|l| l.local_user.id)
.unwrap_or(LocalUserId(-1));
let mut query = post::table
let mut query = post_aggregates::table
.inner_join(person::table)
.inner_join(post::table)
.inner_join(community::table)
.left_join(
community_person_ban::table.on(
post::community_id
post_aggregates::community_id
.eq(community_person_ban::community_id)
.and(community_person_ban::person_id.eq(post::creator_id)),
.and(community_person_ban::person_id.eq(post_aggregates::creator_id)),
),
)
.inner_join(post_aggregates::table)
.left_join(
community_follower::table.on(
post::community_id
post_aggregates::community_id
.eq(community_follower::community_id)
.and(community_follower::person_id.eq(person_id_join)),
),
)
.left_join(
post_saved::table.on(
post::id
post_aggregates::post_id
.eq(post_saved::post_id)
.and(post_saved::person_id.eq(person_id_join)),
),
)
.left_join(
post_read::table.on(
post::id
post_aggregates::post_id
.eq(post_read::post_id)
.and(post_read::person_id.eq(person_id_join)),
),
)
.left_join(
person_block::table.on(
post::creator_id
post_aggregates::creator_id
.eq(person_block::target_id)
.and(person_block::person_id.eq(person_id_join)),
),
)
.left_join(
community_block::table.on(
post::community_id
post_aggregates::community_id
.eq(community_block::community_id)
.and(community_block::person_id.eq(person_id_join)),
),
)
.left_join(
post_like::table.on(
post::id
post_aggregates::post_id
.eq(post_like::post_id)
.and(post_like::person_id.eq(person_id_join)),
),
)
.left_join(
person_post_aggregates::table.on(
post::id
post_aggregates::post_id
.eq(person_post_aggregates::post_id)
.and(person_post_aggregates::person_id.eq(person_id_join)),
),
@ -332,12 +332,12 @@ impl<'a> PostQuery<'a> {
query = query.then_order_by(post_aggregates::featured_local.desc());
} else if let Some(community_id) = self.community_id {
query = query
.filter(post::community_id.eq(community_id))
.filter(post_aggregates::community_id.eq(community_id))
.then_order_by(post_aggregates::featured_community.desc());
}
if let Some(creator_id) = self.creator_id {
query = query.filter(post::creator_id.eq(creator_id));
query = query.filter(post_aggregates::creator_id.eq(creator_id));
}
if let Some(listing_type) = self.listing_type {
@ -1141,6 +1141,8 @@ mod tests {
featured_local: false,
hot_rank: 1728,
hot_rank_active: 1728,
community_id: inserted_post.community_id,
creator_id: inserted_post.creator_id,
},
subscribed: SubscribedType::NotSubscribed,
read: false,

20
migrations/2023-07-18-082614_post_aggregates_community_id/down.sql Normal file
View file

@ -0,0 +1,20 @@
-- This file should undo anything in `up.sql`
CREATE OR REPLACE FUNCTION post_aggregates_post()
RETURNS trigger
LANGUAGE plpgsql
AS
$$
BEGIN
IF (TG_OP = 'INSERT') THEN
INSERT INTO post_aggregates (post_id, published, newest_comment_time, newest_comment_time_necro)
VALUES (NEW.id, NEW.published, NEW.published, NEW.published);
ELSIF (TG_OP = 'DELETE') THEN
DELETE FROM post_aggregates WHERE post_id = OLD.id;
END IF;
RETURN NULL;
END
$$;
ALTER TABLE post_aggregates DROP COLUMN community_id, DROP COLUMN creator_id;

35
migrations/2023-07-18-082614_post_aggregates_community_id/up.sql Normal file
View file

@ -0,0 +1,35 @@
-- Your SQL goes here
ALTER TABLE post_aggregates
ADD COLUMN community_id integer REFERENCES community ON UPDATE CASCADE ON DELETE CASCADE,
ADD COLUMN creator_id integer REFERENCES person ON UPDATE CASCADE ON DELETE CASCADE;
CREATE OR REPLACE FUNCTION post_aggregates_post()
RETURNS trigger
LANGUAGE plpgsql
AS
$$
BEGIN
IF (TG_OP = 'INSERT') THEN
INSERT INTO post_aggregates (post_id,
published,
newest_comment_time,
newest_comment_time_necro,
community_id,
creator_id)
VALUES (NEW.id, NEW.published, NEW.published, NEW.published, NEW.community_id, NEW.creator_id);
ELSIF (TG_OP = 'DELETE') THEN
DELETE FROM post_aggregates WHERE post_id = OLD.id;
END IF;
RETURN NULL;
END
$$;
UPDATE post_aggregates
SET community_id=post.community_id,
creator_id=post.creator_id
FROM post
WHERE post.id = post_aggregates.post_id;
ALTER TABLE post_aggregates
ALTER COLUMN community_id SET NOT NULL,
ALTER COLUMN creator_id SET NOT NULL;