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[bugfix] Fix slow joined home timeline query (#1867)

This commit is contained in:
tobi 2023-06-04 21:17:28 +02:00 committed by tsmethurst
parent d9d0c66899
commit 9e8da5e1f0
1 changed files with 15 additions and 17 deletions
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32
internal/db/bundb/timeline.go
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@ -51,15 +51,7 @@ func (t *timelineDB) GetHomeTimeline(ctx context.Context, accountID string, maxI
NewSelect().
TableExpr("? AS ?", bun.Ident("statuses"), bun.Ident("status")).
// Select only IDs from table
Column("status.id").
// Find out who accountID follows.
Join("LEFT JOIN ? AS ? ON ? = ? AND ? = ?",
bun.Ident("follows"),
bun.Ident("follow"),
bun.Ident("follow.target_account_id"),
bun.Ident("status.account_id"),
bun.Ident("follow.account_id"),
accountID)
Column("status.id")
if maxID == "" || maxID >= id.Highest {
const future = 24 * time.Hour
@ -107,15 +99,21 @@ func (t *timelineDB) GetHomeTimeline(ctx context.Context, accountID string, maxI
q = q.Order("status.id ASC")
}
// Use a WhereGroup here to specify that we want EITHER statuses posted by accounts that accountID follows,
// OR statuses posted by accountID itself (since a user should be able to see their own statuses).
//
// This is equivalent to something like WHERE ... AND (... OR ...)
// See: https://bun.uptrace.dev/guide/queries.html#select
q = q.WhereGroup(" AND ", func(*bun.SelectQuery) *bun.SelectQuery {
// Subquery to select target (followed) account
// IDs from follows owned by given accountID.
subQ := t.conn.
NewSelect().
TableExpr("? AS ?", bun.Ident("follows"), bun.Ident("follow")).
Column("follow.target_account_id").
Where("? = ?", bun.Ident("follow.account_id"), accountID)
// Use the subquery in a WhereGroup here to specify that we want EITHER
// - statuses posted by accountID itself OR
// - statuses posted by accounts that accountID follows
q = q.WhereGroup(" AND ", func(q *bun.SelectQuery) *bun.SelectQuery {
return q.
WhereOr("? = ?", bun.Ident("follow.account_id"), accountID).
WhereOr("? = ?", bun.Ident("status.account_id"), accountID)
Where("? = ?", bun.Ident("status.account_id"), accountID).
WhereOr("? IN (?)", bun.Ident("status.account_id"), subQ)
})
if err := q.Scan(ctx, &statusIDs); err != nil {