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backend: improve removeMentionedRemoteUsersColumn revert query (#403)

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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: https://akkoma.dev/FoundKeyGang/FoundKey/pulls/403
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Norm 2023-07-22 14:10:37 +00:00 committed by naskya
parent 65797a934a
commit 3473442875
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1 changed files with 9 additions and 1 deletions
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10
packages/backend/src/migration/1710688552234-remove-mentioned-users-column.ts
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@ -13,8 +13,16 @@ export class RemoveMentionedUsersColumn1710688552234
await queryRunner.query(
`ALTER TABLE "note" ADD "mentionedRemoteUsers" TEXT NOT NULL DEFAULT '[]'::text`,
);
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(
`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")`,
`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")
)`);
}
}