Fix Posts List Performance + cursor-based pagination (#3872)
* add token-based pagination + fast subscribed post view * add migrations * fix failing heuristic * revert * output pagination token as next_page, fix off-by-one, restructure * more cleanup * clean * format sql * fix comment * fix tests * e * empty * move last page thing * restructure a bit for readability * rename page_cursor * update for scaled sort * fix * sql format * fix * get rid of macros --------- Co-authored-by: Dessalines <dessalines@users.noreply.github.com>
This commit is contained in:
phiresky
GitHub
parent
6735a98d35
commit
544d30f0d4
6 changed files with 414 additions and 82 deletions
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@ -5,7 +5,7 @@ use lemmy_db_schema::{
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PostFeatureType,
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SortType,
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};
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use lemmy_db_views::structs::{PostReportView, PostView};
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use lemmy_db_views::structs::{PaginationCursor, PostReportView, PostView};
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use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
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use serde::{Deserialize, Serialize};
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use serde_with::skip_serializing_none;
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@ -70,6 +70,7 @@ pub struct GetPostResponse {
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pub struct GetPosts {
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pub type_: Option<ListingType>,
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pub sort: Option<SortType>,
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/// DEPRECATED, use page_cursor
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pub page: Option<i64>,
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pub limit: Option<i64>,
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pub community_id: Option<CommunityId>,
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@ -78,6 +79,7 @@ pub struct GetPosts {
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pub liked_only: Option<bool>,
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pub disliked_only: Option<bool>,
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pub auth: Option<Sensitive<String>>,
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pub page_cursor: Option<PaginationCursor>,
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}
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#[derive(Serialize, Deserialize, Debug, Clone)]
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@ -86,6 +88,8 @@ pub struct GetPosts {
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/// The post list response.
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pub struct GetPostsResponse {
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pub posts: Vec<PostView>,
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/// the pagination cursor to use to fetch the next page
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pub next_page: Option<PaginationCursor>,
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}
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#[derive(Debug, Serialize, Deserialize, Clone, Default)]
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@ -11,7 +11,10 @@ use lemmy_api_common::{
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utils::{check_private_instance, local_user_view_from_jwt_opt_new},
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};
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use lemmy_db_schema::source::{community::Community, local_site::LocalSite};
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use lemmy_db_views::{post_view::PostQuery, structs::LocalUserView};
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use lemmy_db_views::{
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post_view::PostQuery,
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structs::{LocalUserView, PaginationCursor},
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};
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use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
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#[tracing::instrument(skip(context))]
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@ -48,6 +51,12 @@ pub async fn list_posts(
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&local_site,
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community_id,
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)?);
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// parse pagination token
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let page_after = if let Some(pa) = &data.page_cursor {
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Some(pa.read(&mut context.pool()).await?)
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} else {
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None
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};
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let posts = PostQuery {
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local_user: local_user_view.as_ref(),
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@ -58,6 +67,7 @@ pub async fn list_posts(
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liked_only,
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disliked_only,
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page,
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page_after,
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limit,
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..Default::default()
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}
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@ -65,5 +75,7 @@ pub async fn list_posts(
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.await
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.with_lemmy_type(LemmyErrorType::CouldntGetPosts)?;
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Ok(Json(GetPostsResponse { posts }))
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// if this page wasn't empty, then there is a next page after the last post on this page
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let next_page = posts.last().map(PaginationCursor::after_post);
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Ok(Json(GetPostsResponse { posts, next_page }))
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}
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@ -1,21 +1,26 @@
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use crate::structs::{LocalUserView, PostView};
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use crate::structs::{LocalUserView, PaginationCursor, PostView};
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use diesel::{
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debug_query,
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dsl::{exists, not, IntervalDsl},
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dsl::{self, exists, not, IntervalDsl},
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expression::AsExpression,
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pg::Pg,
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result::Error,
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sql_function,
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sql_types::{self, Timestamptz},
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sql_types::{self, SingleValue, SqlType, Timestamptz},
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BoolExpressionMethods,
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BoxableExpression,
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Expression,
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ExpressionMethods,
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IntoSql,
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JoinOnDsl,
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NullableExpressionMethods,
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OptionalExtension,
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PgTextExpressionMethods,
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QueryDsl,
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};
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use diesel_async::RunQueryDsl;
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use lemmy_db_schema::{
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aggregates::structs::PostAggregates,
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newtypes::{CommunityId, LocalUserId, PersonId, PostId},
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schema::{
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community,
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@ -28,12 +33,12 @@ use lemmy_db_schema::{
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person_block,
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person_post_aggregates,
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post,
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post_aggregates,
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post_aggregates::{self, newest_comment_time},
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post_like,
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post_read,
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post_saved,
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},
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utils::{fuzzy_search, limit_and_offset, DbConn, DbPool, ListFn, Queries, ReadFn},
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utils::{fuzzy_search, get_conn, limit_and_offset, DbConn, DbPool, ListFn, Queries, ReadFn},
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ListingType,
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SortType,
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};
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@ -41,6 +46,55 @@ use tracing::debug;
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sql_function!(fn coalesce(x: sql_types::Nullable<sql_types::BigInt>, y: sql_types::BigInt) -> sql_types::BigInt);
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fn order_and_page_filter_desc<Q, C, T>(
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query: Q,
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column: C,
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options: &PostQuery,
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getter: impl Fn(&PostAggregates) -> T,
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) -> Q
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where
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Q: diesel::query_dsl::methods::ThenOrderDsl<dsl::Desc<C>, Output = Q>
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+ diesel::query_dsl::methods::ThenOrderDsl<dsl::Asc<C>, Output = Q>
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+ diesel::query_dsl::methods::FilterDsl<dsl::GtEq<C, T>, Output = Q>
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+ diesel::query_dsl::methods::FilterDsl<dsl::LtEq<C, T>, Output = Q>,
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C: Expression + Copy,
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C::SqlType: SingleValue + SqlType,
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T: AsExpression<C::SqlType>,
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{
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let mut query = query.then_order_by(column.desc());
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if let Some(before) = &options.page_before_or_equal {
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query = query.filter(column.ge(getter(&before.0)));
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}
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if let Some(after) = &options.page_after {
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query = query.filter(column.le(getter(&after.0)));
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}
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query
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}
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fn order_and_page_filter_asc<Q, C, T>(
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query: Q,
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column: C,
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options: &PostQuery,
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getter: impl Fn(&PostAggregates) -> T,
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) -> Q
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where
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Q: diesel::query_dsl::methods::ThenOrderDsl<dsl::Asc<C>, Output = Q>
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+ diesel::query_dsl::methods::FilterDsl<dsl::LtEq<C, T>, Output = Q>
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+ diesel::query_dsl::methods::FilterDsl<dsl::GtEq<C, T>, Output = Q>,
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C: Expression + Copy,
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C::SqlType: SingleValue + SqlType,
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T: AsExpression<C::SqlType>,
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{
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let mut query = query.then_order_by(column.asc());
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if let Some(before) = &options.page_before_or_equal {
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query = query.filter(column.le(getter(&before.0)));
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}
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if let Some(after) = &options.page_after {
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query = query.filter(column.ge(getter(&after.0)));
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}
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query
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}
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fn queries<'a>() -> Queries<
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impl ReadFn<'a, PostView, (PostId, Option<PersonId>, bool)>,
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impl ListFn<'a, PostView, PostQuery<'a>>,
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@ -251,13 +305,18 @@ fn queries<'a>() -> Queries<
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.filter(community::removed.eq(false))
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.filter(post::removed.eq(false));
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}
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if options.community_id.is_none() {
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query = query.then_order_by(post_aggregates::featured_local.desc());
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} else if let Some(community_id) = options.community_id {
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query = query
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.filter(post_aggregates::community_id.eq(community_id))
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.then_order_by(post_aggregates::featured_community.desc());
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if options.community_id.is_none() || options.community_id_just_for_prefetch {
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query = order_and_page_filter_desc(query, post_aggregates::featured_local, &options, |e| {
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e.featured_local
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});
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} else {
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query =
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order_and_page_filter_desc(query, post_aggregates::featured_community, &options, |e| {
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e.featured_community
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});
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}
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if let Some(community_id) = options.community_id {
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query = query.filter(post_aggregates::community_id.eq(community_id));
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}
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if let Some(creator_id) = options.creator_id {
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@ -292,12 +351,12 @@ fn queries<'a>() -> Queries<
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}
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}
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if let Some(url_search) = options.url_search {
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if let Some(url_search) = &options.url_search {
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query = query.filter(post::url.eq(url_search));
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}
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if let Some(search_term) = options.search_term {
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let searcher = fuzzy_search(&search_term);
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if let Some(search_term) = &options.search_term {
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let searcher = fuzzy_search(search_term);
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query = query.filter(
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post::name
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.ilike(searcher.clone())
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@ -373,70 +432,91 @@ fn queries<'a>() -> Queries<
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}
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let now = diesel::dsl::now.into_sql::<Timestamptz>();
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query = match options.sort.unwrap_or(SortType::Hot) {
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SortType::Active => query
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.then_order_by(post_aggregates::hot_rank_active.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::Hot => query
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.then_order_by(post_aggregates::hot_rank.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::Scaled => query
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.then_order_by(post_aggregates::scaled_rank.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::Controversial => query.then_order_by(post_aggregates::controversy_rank.desc()),
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SortType::New => query.then_order_by(post_aggregates::published.desc()),
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SortType::Old => query.then_order_by(post_aggregates::published.asc()),
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SortType::NewComments => query.then_order_by(post_aggregates::newest_comment_time.desc()),
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SortType::MostComments => query
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.then_order_by(post_aggregates::comments.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopAll => query
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopYear => query
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.filter(post_aggregates::published.gt(now - 1.years()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopMonth => query
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.filter(post_aggregates::published.gt(now - 1.months()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopWeek => query
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.filter(post_aggregates::published.gt(now - 1.weeks()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopDay => query
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.filter(post_aggregates::published.gt(now - 1.days()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopHour => query
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.filter(post_aggregates::published.gt(now - 1.hours()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopSixHour => query
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.filter(post_aggregates::published.gt(now - 6.hours()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopTwelveHour => query
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.filter(post_aggregates::published.gt(now - 12.hours()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopThreeMonths => query
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.filter(post_aggregates::published.gt(now - 3.months()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopSixMonths => query
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.filter(post_aggregates::published.gt(now - 6.months()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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SortType::TopNineMonths => query
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.filter(post_aggregates::published.gt(now - 9.months()))
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.then_order_by(post_aggregates::score.desc())
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.then_order_by(post_aggregates::published.desc()),
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{
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use post_aggregates::{
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comments,
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controversy_rank,
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hot_rank,
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hot_rank_active,
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published,
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scaled_rank,
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score,
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};
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match options.sort.as_ref().unwrap_or(&SortType::Hot) {
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SortType::Active => {
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query =
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order_and_page_filter_desc(query, hot_rank_active, &options, |e| e.hot_rank_active);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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SortType::Hot => {
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query = order_and_page_filter_desc(query, hot_rank, &options, |e| e.hot_rank);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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SortType::Scaled => {
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query = order_and_page_filter_desc(query, scaled_rank, &options, |e| e.scaled_rank);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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SortType::Controversial => {
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query =
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order_and_page_filter_desc(query, controversy_rank, &options, |e| e.controversy_rank);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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SortType::New => {
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query = order_and_page_filter_desc(query, published, &options, |e| e.published)
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}
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SortType::Old => {
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query = order_and_page_filter_asc(query, published, &options, |e| e.published)
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}
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SortType::NewComments => {
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query = order_and_page_filter_desc(query, newest_comment_time, &options, |e| {
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e.newest_comment_time
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})
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}
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SortType::MostComments => {
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query = order_and_page_filter_desc(query, comments, &options, |e| e.comments);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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SortType::TopAll => {
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query = order_and_page_filter_desc(query, score, &options, |e| e.score);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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o @ (SortType::TopYear
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| SortType::TopMonth
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| SortType::TopWeek
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| SortType::TopDay
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| SortType::TopHour
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| SortType::TopSixHour
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| SortType::TopTwelveHour
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| SortType::TopThreeMonths
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| SortType::TopSixMonths
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| SortType::TopNineMonths) => {
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let interval = match o {
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SortType::TopYear => 1.years(),
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SortType::TopMonth => 1.months(),
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SortType::TopWeek => 1.weeks(),
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SortType::TopDay => 1.days(),
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SortType::TopHour => 1.hours(),
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SortType::TopSixHour => 6.hours(),
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SortType::TopTwelveHour => 12.hours(),
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SortType::TopThreeMonths => 3.months(),
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SortType::TopSixMonths => 6.months(),
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SortType::TopNineMonths => 9.months(),
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_ => return Err(Error::NotFound),
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};
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query = query.filter(post_aggregates::published.gt(now - interval));
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query = order_and_page_filter_desc(query, score, &options, |e| e.score);
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query = order_and_page_filter_desc(query, published, &options, |e| e.published);
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}
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}
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};
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let (limit, offset) = limit_and_offset(options.page, options.limit)?;
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let (limit, mut offset) = limit_and_offset(options.page, options.limit)?;
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if options.page_after.is_some() {
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// always skip exactly one post because that's the last post of the previous page
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// fixing the where clause is more difficult because we'd have to change only the last order-by-where clause
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// e.g. WHERE (featured_local<=, hot_rank<=, published<=) to WHERE (<=, <=, <)
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offset = 1;
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}
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query = query.limit(limit).offset(offset);
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debug!("Post View Query: {:?}", debug_query::<Pg, _>(&query));
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|
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@ -468,12 +548,42 @@ impl PostView {
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}
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}
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#[derive(Default)]
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impl PaginationCursor {
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// get cursor for page that starts immediately after the given post
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pub fn after_post(view: &PostView) -> PaginationCursor {
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// hex encoding to prevent ossification
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PaginationCursor(format!("P{:x}", view.counts.post_id.0))
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}
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pub async fn read(&self, pool: &mut DbPool<'_>) -> Result<PaginationCursorData, Error> {
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Ok(PaginationCursorData(
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PostAggregates::read(
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pool,
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PostId(
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self
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.0
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.get(1..)
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.and_then(|e| i32::from_str_radix(e, 16).ok())
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.ok_or_else(|| Error::QueryBuilderError("Could not parse pagination token".into()))?,
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),
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)
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.await?,
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))
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}
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}
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||||
|
||||
// currently we use a postaggregates struct as the pagination token.
|
||||
// we only use some of the properties of the post aggregates, depending on which sort type we page by
|
||||
#[derive(Clone)]
|
||||
pub struct PaginationCursorData(PostAggregates);
|
||||
|
||||
#[derive(Default, Clone)]
|
||||
pub struct PostQuery<'a> {
|
||||
pub listing_type: Option<ListingType>,
|
||||
pub sort: Option<SortType>,
|
||||
pub creator_id: Option<PersonId>,
|
||||
pub community_id: Option<CommunityId>,
|
||||
// if true, the query should be handled as if community_id was not given except adding the literal filter
|
||||
pub community_id_just_for_prefetch: bool,
|
||||
pub local_user: Option<&'a LocalUserView>,
|
||||
pub search_term: Option<String>,
|
||||
pub url_search: Option<String>,
|
||||
|
|
@ -484,12 +594,98 @@ pub struct PostQuery<'a> {
|
|||
pub is_profile_view: bool,
|
||||
pub page: Option<i64>,
|
||||
pub limit: Option<i64>,
|
||||
pub page_after: Option<PaginationCursorData>,
|
||||
pub page_before_or_equal: Option<PaginationCursorData>,
|
||||
}
|
||||
|
||||
impl<'a> PostQuery<'a> {
|
||||
async fn prefetch_upper_bound_for_page_before(
|
||||
&self,
|
||||
pool: &mut DbPool<'_>,
|
||||
) -> Result<Option<PostQuery<'a>>, Error> {
|
||||
// first get one page for the most popular community to get an upper bound for the the page end for the real query
|
||||
// the reason this is needed is that when fetching posts for a single community PostgreSQL can optimize
|
||||
// the query to use an index on e.g. (=, >=, >=, >=) and fetch only LIMIT rows
|
||||
// but for the followed-communities query it has to query the index on (IN, >=, >=, >=)
|
||||
// which it currently can't do at all (as of PG 16). see the discussion here:
|
||||
// https://github.com/LemmyNet/lemmy/issues/2877#issuecomment-1673597190
|
||||
//
|
||||
// the results are correct no matter which community we fetch these for, since it basically covers the "worst case" of the whole page consisting of posts from one community
|
||||
// but using the largest community decreases the pagination-frame so make the real query more efficient.
|
||||
use lemmy_db_schema::schema::{
|
||||
community_aggregates::dsl::{community_aggregates, community_id, users_active_month},
|
||||
community_follower::dsl::{
|
||||
community_follower,
|
||||
community_id as follower_community_id,
|
||||
person_id,
|
||||
},
|
||||
};
|
||||
let (limit, offset) = limit_and_offset(self.page, self.limit)?;
|
||||
if offset != 0 {
|
||||
return Err(Error::QueryBuilderError(
|
||||
"legacy pagination cannot be combined with v2 pagination".into(),
|
||||
));
|
||||
}
|
||||
let self_person_id = self
|
||||
.local_user
|
||||
.expect("part of the above if")
|
||||
.local_user
|
||||
.person_id;
|
||||
let largest_subscribed = {
|
||||
let conn = &mut get_conn(pool).await?;
|
||||
community_follower
|
||||
.filter(person_id.eq(self_person_id))
|
||||
.inner_join(community_aggregates.on(community_id.eq(follower_community_id)))
|
||||
.order_by(users_active_month.desc())
|
||||
.select(community_id)
|
||||
.limit(1)
|
||||
.get_result::<CommunityId>(conn)
|
||||
.await
|
||||
.optional()?
|
||||
};
|
||||
let Some(largest_subscribed) = largest_subscribed else {
|
||||
// nothing subscribed to? no posts
|
||||
return Ok(None);
|
||||
};
|
||||
|
||||
let mut v = queries()
|
||||
.list(
|
||||
pool,
|
||||
PostQuery {
|
||||
community_id: Some(largest_subscribed),
|
||||
community_id_just_for_prefetch: true,
|
||||
..self.clone()
|
||||
},
|
||||
)
|
||||
.await?;
|
||||
// take last element of array. if this query returned less than LIMIT elements,
|
||||
// the heuristic is invalid since we can't guarantee the full query will return >= LIMIT results (return original query)
|
||||
if (v.len() as i64) < limit {
|
||||
Ok(Some(self.clone()))
|
||||
} else {
|
||||
let page_before_or_equal = Some(PaginationCursorData(v.pop().expect("else case").counts));
|
||||
Ok(Some(PostQuery {
|
||||
page_before_or_equal,
|
||||
..self.clone()
|
||||
}))
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn list(self, pool: &mut DbPool<'_>) -> Result<Vec<PostView>, Error> {
|
||||
if self.listing_type == Some(ListingType::Subscribed)
|
||||
&& self.community_id.is_none()
|
||||
&& self.local_user.is_some()
|
||||
&& self.page_before_or_equal.is_none()
|
||||
{
|
||||
if let Some(query) = self.prefetch_upper_bound_for_page_before(pool).await? {
|
||||
queries().list(pool, query).await
|
||||
} else {
|
||||
Ok(vec![])
|
||||
}
|
||||
} else {
|
||||
queries().list(pool, self).await
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
|
|
|
|||
|
|
@ -89,6 +89,13 @@ pub struct PostReportView {
|
|||
pub resolver: Option<Person>,
|
||||
}
|
||||
|
||||
/// currently this is just a wrapper around post id, but should be seen as opaque from the client's perspective
|
||||
/// stringified since we might want to use arbitrary info later, with a P prepended to prevent ossification
|
||||
/// (api users love to make assumptions (e.g. parse stuff that looks like numbers as numbers) about apis that aren't part of the spec
|
||||
#[derive(Serialize, Deserialize, Debug, Clone)]
|
||||
#[cfg_attr(feature = "full", derive(ts_rs::TS))]
|
||||
pub struct PaginationCursor(pub(crate) String);
|
||||
|
||||
#[skip_serializing_none]
|
||||
#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
|
||||
#[cfg_attr(feature = "full", derive(TS, Queryable))]
|
||||
|
|
|
|||
54
migrations/2023-09-07-215546_post-queries-efficient/down.sql
Normal file
54
migrations/2023-09-07-215546_post-queries-efficient/down.sql
Normal file
|
|
@ -0,0 +1,54 @@
|
|||
DROP INDEX idx_post_aggregates_featured_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_score;
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_active ON post_aggregates (featured_community DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_controversy ON post_aggregates (featured_community DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_hot ON post_aggregates (featured_community DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_scaled ON post_aggregates (featured_community DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_most_comments ON post_aggregates (featured_community DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time ON post_aggregates (featured_community DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time_necro ON post_aggregates (featured_community DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_published ON post_aggregates (featured_community DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_score ON post_aggregates (featured_community DESC, score DESC, published DESC);
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_score;
|
||||
|
||||
59
migrations/2023-09-07-215546_post-queries-efficient/up.sql
Normal file
59
migrations/2023-09-07-215546_post-queries-efficient/up.sql
Normal file
|
|
@ -0,0 +1,59 @@
|
|||
-- these indices are used for single-community filtering and for the followed-communities (front-page) query
|
||||
-- basically one index per Sort
|
||||
-- index name is truncated to 63 chars so abbreviate a bit
|
||||
CREATE INDEX idx_post_aggregates_community_active ON post_aggregates (community_id, featured_local DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_controversy ON post_aggregates (community_id, featured_local DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_hot ON post_aggregates (community_id, featured_local DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_scaled ON post_aggregates (community_id, featured_local DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_most_comments ON post_aggregates (community_id, featured_local DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_newest_comment_time ON post_aggregates (community_id, featured_local DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_newest_comment_time_necro ON post_aggregates (community_id, featured_local DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_published ON post_aggregates (community_id, featured_local DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_score ON post_aggregates (community_id, featured_local DESC, score DESC, published DESC);
|
||||
|
||||
-- these indices are used for "per-community" filtering
|
||||
-- these indices weren't really useful because whenever the query filters by featured_community it also filters by community_id, so prepend that to all these indexes
|
||||
DROP INDEX idx_post_aggregates_featured_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_score;
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_active ON post_aggregates (community_id, featured_community DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_controversy ON post_aggregates (community_id, featured_community DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_hot ON post_aggregates (community_id, featured_community DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_scaled ON post_aggregates (community_id, featured_community DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_most_comments ON post_aggregates (community_id, featured_community DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time ON post_aggregates (community_id, featured_community DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time_necro ON post_aggregates (community_id, featured_community DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_published ON post_aggregates (community_id, featured_community DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_score ON post_aggregates (community_id, featured_community DESC, score DESC, published DESC);
|
||||
|
||||
Loading…
Reference in a new issue