From 6e63866cc952ae0c0f8dd9cbf6e68a16e7081486 Mon Sep 17 00:00:00 2001 From: yuetsh <517252939@qq.com> Date: Sun, 13 Sep 2026 23:47:24 -0600 Subject: [PATCH] =?UTF-8?q?perf(=E6=8F=90=E4=BA=A4=E5=88=97=E8=A1=A8):=20?= =?UTF-8?q?=E6=8C=89=E7=94=A8=E6=88=B7=E5=90=8D=E3=80=81=E9=A2=98=E5=8F=B7?= =?UTF-8?q?=E7=AD=9B=E9=80=89=E8=B5=B0=E7=B4=A2=E5=BC=95=EF=BC=8C=E4=B8=8D?= =?UTF-8?q?=E5=86=8D=E6=89=AB=E5=85=A8=E8=A1=A8?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 用户名筛选：user_id 先查成字面列表，不再把子查询夹在 OR 里（那样整条 OR 不可索引）， 加 trigram 索引接住 ilike '%x%'；翻页先圈出匹配行再排序取页，避开规划器顺着时间索引 倒扫、边扫边滤的计划。快照上查一个班 70~107ms → 5~14ms；匹配 9.5 万条的年级前缀 从 34ms 变成 70~90ms，实际不这么查。 题号筛选：先解析成 problem.id，加 (problem_id, create_time, id) 部分索引。老题和 不存在的题号不再倒扫大半张表（34~67ms → 4ms），题号筛选也能走游标深翻页， count 不再 join problem。 迁移 0015 装 pg_trgm（官方镜像自带 contrib，trusted 扩展）。39 个筛选组合的响应 与改动前逐字节一致。 Co-Authored-By: Claude Opus 5 Claude-Session: https://claude.ai/code/session_01Xg91q3JsunDE7EYoi9G3i2 --- .../src/db/0015_submission_filter_indexes.sql | 9 + apps/api/src/db/meta/0015_snapshot.json | 3738 +++++++++++++++++ apps/api/src/db/meta/_journal.json | 7 + apps/api/src/db/schema.ts | 17 + apps/api/src/routes/submission.ts | 118 +- 5 files changed, 3850 insertions(+), 39 deletions(-) create mode 100644 apps/api/src/db/0015_submission_filter_indexes.sql create mode 100644 apps/api/src/db/meta/0015_snapshot.json diff --git a/apps/api/src/db/0015_submission_filter_indexes.sql b/apps/api/src/db/0015_submission_filter_indexes.sql new file mode 100644 index 0000000..4eafc18 --- /dev/null +++ b/apps/api/src/db/0015_submission_filter_indexes.sql @@ -0,0 +1,9 @@ +-- 提交列表「题号」「用户名」两个筛选的索引，用法和实测数据见 schema.ts 里两条索引的注释。 +-- +-- pg_trgm 是 contrib 模块，要先装扩展，drizzle-kit generate 不会替你写这一句。 +-- 官方 postgres:16-alpine 镜像自带 contrib，且 pg_trgm 是 trusted 扩展（PG 13 起）， +-- 库 owner 就能装。换成不带 contrib 的 Postgres 时这里会失败、部署停在迁移这步。 +-- CREATE EXTENSION 可以在事务里执行，不需要 no-transaction 标记。 +CREATE EXTENSION IF NOT EXISTS pg_trgm;--> statement-breakpoint +CREATE INDEX "submission_public_problem_time_idx" ON "submission" USING btree ("problem_id","create_time","id") WHERE "submission"."contest_id" is null;--> statement-breakpoint +CREATE INDEX "submission_public_username_trgm_idx" ON "submission" USING gin ("username" gin_trgm_ops) WHERE "submission"."contest_id" is null; diff --git a/apps/api/src/db/meta/0015_snapshot.json b/apps/api/src/db/meta/0015_snapshot.json new file mode 100644 index 0000000..424fdec --- /dev/null +++ b/apps/api/src/db/meta/0015_snapshot.json @@ -0,0 +1,3738 @@ +{ + "id": "12879e2e-f8bd-4648-8686-1c582b87b298", + "prevId": "75717ae1-3cd8-40f1-83f1-018b8e6d6017", + "version": "7", + "dialect": "postgresql", + "tables": { + "public.achievement": { + "name": "achievement", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "bigint", + "primaryKey": true, + "notNull": true, + "identity": { + "type": "byDefault", + "name": "achievement_id_seq", + "schema": "public", + "increment": "1", + "startWith": "1", + "minValue": "1", + "maxValue": "9223372036854775807", + "cache": "1", + "cycle": false + } + }, + "name": { + "name": "name", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "description": { + "name": "description", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "icon": { + "name": "icon", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "rarity": { + "name": "rarity", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "hidden": { + "name": "hidden", + "type": "boolean", + "primaryKey": false, + "notNull": true, + "default": false + }, + "metric": { + "name": "metric", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "operator": { + "name": "operator", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "threshold": { + "name": "threshold", + "type": "integer", + "primaryKey": false, + "notNull": true + }, + "visible": { + "name": "visible", + 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"isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "int4_ops" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + } + }, + "foreignKeys": { + "tutorial_created_by_id_07973cab_fk_user_id": { + "name": "tutorial_created_by_id_07973cab_fk_user_id", + "tableFrom": "tutorial", + "tableTo": "user", + "columnsFrom": [ + "created_by_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "no action", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": {}, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.tutorial_progress": { + "name": "tutorial_progress", + "schema": "", + "columns": { + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + }, + "tutorial_id": { + "name": "tutorial_id", + "type": "integer", + "primaryKey": false, + "notNull": true + }, + "view_count": { + "name": "view_count", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "total_seconds": { + "name": "total_seconds", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "first_viewed_at": { + "name": "first_viewed_at", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + }, + "last_viewed_at": { + "name": "last_viewed_at", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + } + }, + "indexes": { + "tutorial_progress_tutorial_id_idx": { + "name": "tutorial_progress_tutorial_id_idx", + "columns": [ + { + "expression": "tutorial_id", + "isExpression": false, + "asc": true, + "nulls": "last" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + } + }, + "foreignKeys": { + "tutorial_progress_user_id_fk_user_id": { + "name": "tutorial_progress_user_id_fk_user_id", + "tableFrom": "tutorial_progress", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + }, + "tutorial_progress_tutorial_id_fk_tutorial_id": { + "name": "tutorial_progress_tutorial_id_fk_tutorial_id", + "tableFrom": "tutorial_progress", + "tableTo": "tutorial", + "columnsFrom": [ + "tutorial_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": { + "tutorial_progress_pkey": { + "name": "tutorial_progress_pkey", + "columns": [ + "user_id", + "tutorial_id" + ] + } + }, + "uniqueConstraints": {}, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user": { + "name": "user", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "serial", + "primaryKey": true, + "notNull": true + }, + "password": { + "name": "password", + "type": "varchar(128)", + "primaryKey": false, + "notNull": true + }, + "last_login": { + "name": "last_login", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": false + }, + "username": { + "name": "username", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "email": { + "name": "email", + "type": "text", + "primaryKey": false, + "notNull": false + }, + "create_time": { + "name": "create_time", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": false + }, + "admin_type": { + "name": "admin_type", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "is_disabled": { + "name": "is_disabled", + "type": "boolean", + "primaryKey": false, + "notNull": true, + "default": false + }, + "problem_permission": { + "name": "problem_permission", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "raw_password": { + "name": "raw_password", + "type": "varchar(20)", + "primaryKey": false, + "notNull": false + }, + "class_name": { + "name": "class_name", + "type": "text", + "primaryKey": false, + "notNull": false + } + }, + "indexes": { + "user_active_idx": { + "name": "user_active_idx", + "columns": [ + { + "expression": "is_disabled", + "isExpression": false, + "asc": true, + "nulls": "last" + }, + { + "expression": "last_login", + "isExpression": false, + "asc": false, + "nulls": "first" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + }, + "user_class_name_idx": { + "name": "user_class_name_idx", + "columns": [ + { + "expression": "class_name", + "isExpression": false, + "asc": true, + "nulls": "last" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + } + }, + "foreignKeys": {}, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "user_username_key": { + "name": "user_username_key", + "nullsNotDistinct": false, + "columns": [ + "username" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user_achievement": { + "name": "user_achievement", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "bigint", + "primaryKey": true, + "notNull": true, + "identity": { + "type": "byDefault", + "name": "user_achievement_id_seq", + "schema": "public", + "increment": "1", + "startWith": "1", + "minValue": "1", + "maxValue": "9223372036854775807", + "cache": "1", + "cycle": false + } + }, + "unlock_time": { + "name": "unlock_time", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + }, + "backfilled": { + "name": "backfilled", + "type": "boolean", + "primaryKey": false, + "notNull": true, + "default": false + }, + "notified": { + "name": "notified", + "type": "boolean", + "primaryKey": false, + "notNull": true, + "default": false + }, + "achievement_id": { + "name": "achievement_id", + "type": "bigint", + "primaryKey": false, + "notNull": true + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + } + }, + "indexes": { + "user_achievement_achievement_id_29db600d": { + "name": "user_achievement_achievement_id_29db600d", + "columns": [ + { + "expression": "achievement_id", + "isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "int8_ops" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + }, + "user_achv_notified_idx": { + "name": "user_achv_notified_idx", + "columns": [ + { + "expression": "user_id", + "isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "int4_ops" + }, + { + "expression": "notified", + "isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "bool_ops" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + }, + "user_achv_time_idx": { + "name": "user_achv_time_idx", + "columns": [ + { + "expression": "user_id", + "isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "int4_ops" + }, + { + "expression": "unlock_time", + "isExpression": false, + "asc": false, + "nulls": "first", + "opclass": "timestamptz_ops" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + } + }, + "foreignKeys": { + "user_achievement_achievement_id_29db600d_fk_achievement_id": { + "name": "user_achievement_achievement_id_29db600d_fk_achievement_id", + "tableFrom": "user_achievement", + "tableTo": "achievement", + "columnsFrom": [ + "achievement_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + }, + "user_achievement_user_id_b8ec7d6a_fk_user_id": { + "name": "user_achievement_user_id_b8ec7d6a_fk_user_id", + "tableFrom": "user_achievement", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "no action", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "unique_user_achievement": { + "name": "unique_user_achievement", + "nullsNotDistinct": false, + "columns": [ + "achievement_id", + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user_badge": { + "name": "user_badge", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "bigint", + "primaryKey": true, + "notNull": true, + "identity": { + "type": "byDefault", + "name": "user_badge_id_seq", + "schema": "public", + "increment": "1", + "startWith": "1", + "minValue": "1", + "maxValue": "9223372036854775807", + "cache": "1", + "cycle": false + } + }, + "earned_time": { + "name": "earned_time", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + }, + "badge_id": { + "name": "badge_id", + "type": "bigint", + "primaryKey": false, + "notNull": true + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + } + }, + "indexes": { + "user_badge_badge_id_92a983e9": { + "name": "user_badge_badge_id_92a983e9", + "columns": [ + { + "expression": "badge_id", + "isExpression": false, + "asc": true, + "nulls": "last", + "opclass": "int8_ops" + } + ], + "isUnique": false, + "concurrently": false, + "method": "btree", + "with": {} + } + }, + "foreignKeys": { + "user_badge_badge_id_92a983e9_fk_problemset_badge_id": { + "name": "user_badge_badge_id_92a983e9_fk_problemset_badge_id", + "tableFrom": "user_badge", + "tableTo": "problemset_badge", + "columnsFrom": [ + "badge_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + }, + "user_badge_user_id_a286d718_fk_user_id": { + "name": "user_badge_user_id_a286d718_fk_user_id", + "tableFrom": "user_badge", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "no action", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "unique_user_badge": { + "name": "unique_user_badge", + "nullsNotDistinct": false, + "columns": [ + "badge_id", + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user_profile": { + "name": "user_profile", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "serial", + "primaryKey": true, + "notNull": true + }, + "acm_problems_status": { + "name": "acm_problems_status", + "type": "jsonb", + "primaryKey": false, + "notNull": true, + "default": "'{}'::jsonb" + }, + "avatar": { + "name": "avatar", + "type": "text", + "primaryKey": false, + "notNull": true + }, + "mood": { + "name": "mood", + "type": "text", + "primaryKey": false, + "notNull": false + }, + "accepted_number": { + "name": "accepted_number", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "submission_number": { + "name": "submission_number", + "type": "integer", + "primaryKey": false, + "notNull": true, + "default": 0 + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + }, + "real_name": { + "name": "real_name", + "type": "text", + "primaryKey": false, + "notNull": false + } + }, + "indexes": {}, + "foreignKeys": { + "user_profile_user_id_8fdce8e2_fk_user_id": { + "name": "user_profile_user_id_8fdce8e2_fk_user_id", + "tableFrom": "user_profile", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "user_profile_user_id_key": { + "name": "user_profile_user_id_key", + "nullsNotDistinct": false, + "columns": [ + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + }, + "public.user_stat": { + "name": "user_stat", + "schema": "", + "columns": { + "id": { + "name": "id", + "type": "bigint", + "primaryKey": true, + "notNull": true, + "identity": { + "type": "byDefault", + "name": "user_stat_id_seq", + "schema": "public", + "increment": "1", + "startWith": "1", + "minValue": "1", + "maxValue": "9223372036854775807", + "cache": "1", + "cycle": false + } + }, + "metrics": { + "name": "metrics", + "type": "jsonb", + "primaryKey": false, + "notNull": true, + "default": "'{}'::jsonb" + }, + "update_time": { + "name": "update_time", + "type": "timestamp with time zone", + "primaryKey": false, + "notNull": true + }, + "user_id": { + "name": "user_id", + "type": "integer", + "primaryKey": false, + "notNull": true + } + }, + "indexes": {}, + "foreignKeys": { + "user_stat_user_id_73337fc0_fk_user_id": { + "name": "user_stat_user_id_73337fc0_fk_user_id", + "tableFrom": "user_stat", + "tableTo": "user", + "columnsFrom": [ + "user_id" + ], + "columnsTo": [ + "id" + ], + "onDelete": "cascade", + "onUpdate": "no action" + } + }, + "compositePrimaryKeys": {}, + "uniqueConstraints": { + "user_stat_user_id_key": { + "name": "user_stat_user_id_key", + "nullsNotDistinct": false, + "columns": [ + "user_id" + ] + } + }, + "policies": {}, + "checkConstraints": {}, + "isRLSEnabled": false + } + }, + "enums": {}, + "schemas": {}, + "sequences": {}, + "roles": {}, + "policies": {}, + "views": {}, + "_meta": { + "columns": {}, + "schemas": {}, + "tables": {} + } +} \ No newline at end of file diff --git a/apps/api/src/db/meta/_journal.json b/apps/api/src/db/meta/_journal.json index 53640bb..2d8a3c7 100644 --- a/apps/api/src/db/meta/_journal.json +++ b/apps/api/src/db/meta/_journal.json @@ -106,6 +106,13 @@ "when": 1789034426259, "tag": "0014_drop_django_migrations", "breakpoints": true + }, + { + "idx": 15, + "version": "7", + "when": 1789364546358, + "tag": "0015_submission_filter_indexes", + "breakpoints": true } ] } \ No newline at end of file diff --git a/apps/api/src/db/schema.ts b/apps/api/src/db/schema.ts index 0217f9c..a35c5f9 100644 --- a/apps/api/src/db/schema.ts +++ b/apps/api/src/db/schema.ts @@ -545,6 +545,23 @@ export const submission = pgTable("submission", { */ index("submission_language_time_idx").using("btree", table.language.asc().nullsLast(), table.createTime.asc().nullsLast()).where(sql`${table.contestId} is null`), index("submission_result_time_idx").using("btree", table.result.asc().nullsLast(), table.createTime.asc().nullsLast()).where(sql`${table.contestId} is null`), + /** + * 提交列表的「题号」筛选。路由先把题号解析成 problem.id（见 routes/submission.ts 的 + * problemFilter），这条索引才用得上：等值定位到一道题，剩下两列正好是翻页的全序， + * 深翻页的游标也照走。列方向同上面几条，全 ASC 靠 Backward 扫。 + * + * problem_user_idx 以 problem_id 打头，但不带时间：一道题最近几个月没人交的话， + * 规划器照样选分页索引倒扫、边扫边滤。快照实测 1047（6 月之后没人交）17ms 倒扫 + * 2 万行、3017（最后一次在 2024 年）59ms 倒扫 8.2 万行、不存在的题号扫完全表。 + */ + index("submission_public_problem_time_idx").using("btree", table.problemId.asc().nullsLast(), table.createTime.asc().nullsLast(), table.id.asc().nullsLast()).where(sql`${table.contestId} is null`), + /** + * 提交列表的「用户名」筛选是 `ilike '%x%'`，btree 帮不上，只有 trigram 能索引中缀匹配。 + * 扩展在迁移 0015 里装（官方 postgres 镜像自带 contrib，pg_trgm 是 trusted 扩展）。 + * 3MB。模式不足 3 个字符时 trigram 抽不出东西，照旧全表扫——那种前缀匹配大半张表， + * 扫表本来就是对的计划。 + */ + index("submission_public_username_trgm_idx").using("gin", table.username.op("gin_trgm_ops")).where(sql`${table.contestId} is null`), /** * 覆盖索引，专门给「在全部公开提交上做聚合」那几个接口用：教师统计不填班级、 * 活跃榜、题目 AC 趋势。它们慢的**不是聚合本身，是为了读这四个小列把 145MB 的堆 diff --git a/apps/api/src/routes/submission.ts b/apps/api/src/routes/submission.ts index d8a056b..770553c 100644 --- a/apps/api/src/routes/submission.ts +++ b/apps/api/src/routes/submission.ts @@ -360,13 +360,36 @@ async function matchedUsers(username: string) { * * 统计接口那边只按 user_id 筛（口径是「花名册上这个班谁做完了」，已删号的人本来 * 就不在花名册里）；这两条是公开列表，不该因为改名或删号少给记录，所以取并集。 + * + * 账号那一支**先查出 id 再拼成字面列表**，不写成 `user_id in (子查询)`：子查询夹在 OR + * 里会被做成 hashed SubPlan，整条 OR 就不可索引，加了 trigram 索引照样全表扫。拆开之后 + * 两支各走各的索引（submission_public_metrics_idx + submission_public_username_trgm_idx）， + * 快照实测 count 65ms → 0.6ms。`ks2` 这种匹配上千个账号的宽前缀退回扫表，30~50ms， + * 和原来持平。 */ -function usernameFilter(username: string) { +async function usernameFilter(username: string) { const like = `%${username}%` - return or( - sql`${schema.submission.userId} in (select ${schema.user.id} from ${schema.user} where ${ilike(schema.user.username, like)})`, - ilike(schema.submission.username, like), - )! + const users = await db.select({ id: schema.user.id }).from(schema.user) + .where(ilike(schema.user.username, like)) + const frozen = ilike(schema.submission.username, like) + return users.length ? or(inArray(schema.submission.userId, users.map((row) => row.id)), frozen)! : frozen +} + +/** + * 两条提交列表的题号筛选：先把题号解析成 problem.id，再按 `submission.problem_id` 筛。 + * 原来是 join problem 之后比 `lower(problem._id)`，条件落在 problem 表上，规划器只能 + * 顺着时间索引倒扫、逐行回表比对，走不上 submission_public_problem_time_idx。 + * + * 公开列表只认公开题、比赛列表只认本场的题：题号只在这个范围内唯一（比赛题的 `_id` + * 和公开题撞号是常态），而公开提交从不指向比赛题（快照核过，0 条）。 + * 查无此题时留恒假条件，少推一个 filter 就成了「不筛」。 + */ +async function problemFilter(displayId: string, contestId: number | null) { + const problems = await db.select({ id: schema.problem.id }).from(schema.problem).where(and( + sql`lower(${schema.problem.displayId}) = lower(${displayId})`, + contestId === null ? isNull(schema.problem.contestId) : eq(schema.problem.contestId, contestId), + )) + return problems.length ? inArray(schema.submission.problemId, problems.map((row) => row.id)) : sql`false` } /** @@ -879,18 +902,24 @@ async function submissionDetail(id: string, user: AuthUser) { * 游标用 `<=` 回查时同毫秒的上一页末行会重复出现在下一页页首。索引已按 (create_time DESC, * id DESC) 建好，带上 id 不会多出 Sort 节点。 * - * 两种情况退回普通 offset：offset 为 0 时没有可跳过的行，白搭一次往返；按题号筛选时条件 - * 在 problem 表上，第一步得跟着 join、index-only 就没了——而那时结果集只剩几百条， - * offset 本来也不慢。 + * offset 为 0 时没有可跳过的行，直接取，省一次往返。 + * + * **按用户名筛选另走一条路**：先把匹配的行整个圈出来（`materialized` 挡住规划器）， + * 在圈里排序取页，再按主键回表。不圈的话规划器一见 `ORDER BY ... LIMIT` 就选时间索引 + * 倒扫、边扫边滤——它按平均密度估一个班的提交散布在全表，实际上一个班的提交扎堆在它 + * 上课的那一两年，早就毕业的班要倒扫大半张表。快照实测第一页：ks248 66ms → 0.75ms、 + * ks225 142ms → 2.7ms、ks212 翻到 1000 条 79ms → 3.6ms。圈的代价和匹配行数成正比， + * 最宽的 `ks2`（9.5 万行）要 65ms，和同一请求里 count 扫表的量级一样，不另外拖慢响应。 + * 游标那条路帮不了它：第一步游标定位本身就是同一个倒扫。 */ async function paginateSubmissionRows( where: SQL | undefined, limit: number, offset: number, - filtersNeedProblem: boolean, + byUsername: boolean, ) { const order = [desc(schema.submission.createTime), desc(schema.submission.id)] as const - const page = (cursor?: SQL) => + const page = (condition: SQL | undefined) => db .select(submissionListColumns) .from(schema.submission) @@ -898,10 +927,21 @@ async function paginateSubmissionRows( // 取当前用户名用。left join 不是 inner —— 已删号的学生这边没有行， // inner join 会把他们的提交整条从列表里抹掉 .leftJoin(schema.user, eq(schema.user.id, schema.submission.userId)) - .where(cursor ? and(where, cursor) : where) + .where(condition) .orderBy(...order) + .limit(limit) - if (offset === 0 || filtersNeedProblem) return page().limit(limit).offset(offset) + if (byUsername) { + const matched = db + .select({ id: schema.submission.id, createTime: schema.submission.createTime }) + .from(schema.submission) + .where(where) + return page(sql`${schema.submission.id} in ( + with matched as materialized ${matched} + select id from matched order by create_time desc, id desc limit ${limit} offset ${offset} + )`) + } + if (offset === 0) return page(where) const [boundary] = await db .select({ createTime: schema.submission.createTime, id: schema.submission.id }) @@ -913,9 +953,10 @@ async function paginateSubmissionRows( // offset 越过了结果集尾巴，这一页本来就该是空的 if (!boundary) return [] - return page( + return page(and( + where, sql`(${schema.submission.createTime}, ${schema.submission.id}) <= (${boundary.createTime}::timestamptz, ${boundary.id}::text)`, - ).limit(limit) + )) } /** @@ -940,27 +981,27 @@ submissionRoutes.get("/submissions", optionalAuth, async (c) => { if (!(await getBooleanOption("submission_list_show_all", true)) && !isAdminRole(user)) { return success(c, { results: [], total: 0 } satisfies SubmissionList) } - const filters = [isNull(schema.submission.contestId)] const displayId = c.req.query("problemId")?.trim() - const username = c.req.query("username")?.trim() + const myself = c.req.query("myself") === "1" ? user : null + // 「只看自己」盖过用户名 + const username = myself ? undefined : c.req.query("username")?.trim() const result = c.req.query("result") const language = c.req.query("language")?.trim() - if (displayId) filters.push(sql`lower(${schema.problem.displayId}) = lower(${displayId})`) - if (c.req.query("myself") === "1" && user) filters.push(eq(schema.submission.userId, user.id)) - else if (username) filters.push(usernameFilter(username)) + const filters: Array = [isNull(schema.submission.contestId)] + filters.push(...await Promise.all([ + displayId ? problemFilter(displayId, null) : undefined, + username ? usernameFilter(username) : undefined, + ])) + if (myself) filters.push(eq(schema.submission.userId, myself.id)) if (result !== undefined && result !== "" && Number.isInteger(Number(result))) filters.push(eq(schema.submission.result, asFilterValue(Number(result)))) if (language) filters.push(eq(schema.submission.language, asFilterValue(language))) if (c.req.query("today") === "1") filters.push(sql`${schema.submission.createTime} >= ${todayStart()}`) const where = and(...filters) - // count 不 join problem：problem 只有按题号筛选时才出现在 where 里，无条件 join 会让 - // 计划器把 count 退化成 seq scan（生产快照实测 7.5ms → 78ms）。 - const totalQuery = displayId - ? db.select({ value: count() }).from(schema.submission) - .innerJoin(schema.problem, eq(schema.submission.problemId, schema.problem.id)).where(where) - : db.select({ value: count() }).from(schema.submission).where(where) + // count 不 join problem：无条件 join 会让计划器把 count 退化成 seq scan + // （生产快照实测 7.5ms → 78ms）。题号已经解析成 problem_id，也用不着 join。 const [totalRows, rows] = await Promise.all([ - totalQuery, - paginateSubmissionRows(where, limit, offset, Boolean(displayId)), + db.select({ value: count() }).from(schema.submission).where(where), + paginateSubmissionRows(where, limit, offset, Boolean(username)), ]) // 闸门只对学生自己的提交生效，所以只拿这一页里属于他自己的题目去查，一页一次查询 const [joinTimes, problemsetTitles] = await Promise.all([ @@ -997,25 +1038,24 @@ submissionRoutes.get("/contests/:contestId/submissions", optionalAuth, requireCo const contest = c.get("contest")! const limit = queryInteger(c.req.query("limit"), 10, { min: 1, max: 250 }) const offset = queryInteger(c.req.query("offset"), 0, { min: 0 }) - const filters = [eq(schema.submission.contestId, contest.id)] const user = c.get("user") const displayId = c.req.query("problemId")?.trim() - const username = c.req.query("username")?.trim() + const myself = c.req.query("myself") === "1" ? user : null + const username = myself ? undefined : c.req.query("username")?.trim() const result = c.req.query("result") - if (displayId) filters.push(sql`lower(${schema.problem.displayId}) = lower(${displayId})`) - if (c.req.query("myself") === "1" && user) filters.push(eq(schema.submission.userId, user.id)) - else if (username) filters.push(usernameFilter(username)) + const filters: Array = [eq(schema.submission.contestId, contest.id)] + filters.push(...await Promise.all([ + displayId ? problemFilter(displayId, contest.id) : undefined, + username ? usernameFilter(username) : undefined, + ])) + if (myself) filters.push(eq(schema.submission.userId, myself.id)) if (result !== undefined && result !== "" && Number.isInteger(Number(result))) filters.push(eq(schema.submission.result, asFilterValue(Number(result)))) if (contestStatus(contest) !== "1") filters.push(sql`${schema.submission.createTime} >= ${contest.startTime}`) const where = and(...filters) - // count 不 join problem：problem 只有按题号筛选时才出现在 where 里，无条件 join 会让 - // 计划器把 count 退化成 seq scan（生产快照实测 7.5ms → 78ms）。 - const totalQuery = displayId - ? db.select({ value: count() }).from(schema.submission) - .innerJoin(schema.problem, eq(schema.submission.problemId, schema.problem.id)).where(where) - : db.select({ value: count() }).from(schema.submission).where(where) + // 一场比赛最多一两千条提交，按 contest_create_time_idx 定位之后怎么滤都不贵， + // 所以不像公开列表那样分游标 / 圈选两条路 const [totalRows, rows] = await Promise.all([ - totalQuery, + db.select({ value: count() }).from(schema.submission).where(where), db.select(submissionListColumns).from(schema.submission) .innerJoin(schema.problem, eq(schema.submission.problemId, schema.problem.id)) .leftJoin(schema.user, eq(schema.user.id, schema.submission.userId)).where(where)