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backend: improve removeMentionedRemoteUsersColumn revert query (#403)
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Browse source 
This is an optimized version made by Volpeon that should run faster if
the instance has a lot of notes.

See <https://is-a.wyvern.rip/notes/9habqldl6j> for a comparison of the
EXPLAIN ANALYZE of the old and new queries.

Co-authored-by: Volpeon <git@volpeon.ink>

Reviewed-on: #403
This commit is contained in:
Norm 2023-07-22 14:10:37 +00:00
parent 650b797fd6
commit dbe2b7611d
1 changed files with 9 additions and 1 deletions
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10
packages/backend/migration/1661376843000-remove-mentioned-remote-users-column.js
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@ -7,6 +7,14 @@ export class removeMentionedRemoteUsersColumn1661376843000 {
async down(queryRunner) { async down(queryRunner) {
await queryRunner.query(`ALTER TABLE "note" ADD "mentionedRemoteUsers" TEXT NOT NULL DEFAULT '[]'::text`); await queryRunner.query(`ALTER TABLE "note" ADD "mentionedRemoteUsers" TEXT NOT NULL DEFAULT '[]'::text`);
await queryRunner.query(`UPDATE "note" SET "mentionedRemoteUsers" = (SELECT COALESCE(json_agg(row_to_json("data"))::text, '[]') FROM (SELECT "url", "uri", "username", "host" FROM "user" JOIN "user_profile" ON "user"."id" = "user_profile". "userId" WHERE "user"."host" IS NOT NULL AND "user"."id" = ANY("note"."mentions")) AS "data")`); await queryRunner.query(`CREATE TEMP TABLE IF NOT EXISTS "temp_mentions" AS
SELECT "id", "url", "uri", "username", "host"
FROM "user"
JOIN "user_profile" ON "user"."id" = "user_profile". "userId" WHERE "user"."host" IS NOT NULL`);
await queryRunner.query(`CREATE UNIQUE INDEX "temp_mentions_id" ON "temp_mentions"("id")`);
await queryRunner.query(`UPDATE "note" SET "mentionedRemoteUsers" = (
SELECT COALESCE(json_agg(row_to_json("data")::jsonb - 'id')::text, '[]') FROM "temp_mentions" AS "data"
WHERE "data"."id" = ANY("note"."mentions")
)`);
} }
} }