-- 作者:tianyu.chu -- 日期:2026-07-17 -- 工单:(无) -- 目的:拼团全量最新态日常 merge —— full dt=${dt} = 昨日全量中今天没变的 + 今日增量 -- 状态:[草案] -- 备注:sched=T,${dt}=业务日 T-1、${pdt}=T-2(即前一天的 full)。 -- -- **反连接而非窗口函数**:今天的全量 = 「昨日全量 LEFT ANTI JOIN 今日增量 id」+「今日增量」。 -- 右侧只有当日变更的 id(千级),Spark 会 broadcast,全量表只扫不 shuffle、也不排序。 -- 若改用 ROW_NUMBER() OVER (PARTITION BY id) 套在 union 上,等于每天把全量按 id 全shuffle+排序一遍, -- 增量才几千行却要搬动全表,merge 的意义就没了。 -- 正确性:ODS inc 单个 dt 分区内一个 id 只有一行(已按 (id, ods_dt) 去重),且 inc dt=${dt} -- 意味着该记录最后变更就在当天、必然比昨日全量那版新 —— 故「变了的取 inc、没变的留昨日」 -- 与「取 max(update_time)」等价。 -- 注:LEFT ANTI JOIN 是 Spark SQL 语法(Hive 2.1 不支持),本 SQL 走 spark-sql-starter,无碍。 -- -- **静态分区写入**(PARTITION(dt='${dt}'))是硬要求:本 SQL 读 full dt=${pdt} 又写 full, -- 若用动态分区(PARTITION(dt)),输出路径=表根目录、与读的分区路径重叠,Spark 会报 -- "Cannot overwrite a path that is also being read from"。静态分区的输出是具体分区目录,不重叠。 -- 起点由 manual/backfill/20260717_..._ful_d_seed.sql 一次性 seed;断链需重新 seed。 -- 历史多版本在 inc 表(拉链底座),本表只保当前态。lock 是保留字,SELECT 里必须带反引号。 -- -- **分区保留 2 天**(只留 ${dt} 与 ${pdt}):文末 ALTER 精确 drop ${rdt}(=${dt}-2,即 T-3), -- 每天正好掉一个。用精确分区值而非 dt < 'x'——Spark SQL 的 DROP PARTITION 只接受 col=value, -- 比较式是 Hive 语法、Spark 解析不了。DS 需额外传参 rdt=$[yyyyMMdd-3];手动跑加 -p rdt=。 -- 代价:漏跑一天则那天本该掉的分区不会被补 drop,需手工清;断链重新 seed 即可。 INSERT OVERWRITE TABLE ods.ods_trd_card_group_info_ful_d PARTITION (dt='${dt}') -- 昨日全量里今天没变的 SELECT id, merchant_id, appid, name, code, status, specs, type, random_type, total_price, copies, unit_price, sold_copies, release_time, cycle, show_applet, title, msg, remark, create_time, update_by, update_time, order_quota_min, order_quota_max, user_quota_max, start_time, marketing_info, reviewmsg, `lock`, commission_rate, year, sport, manufacturer, sets, act, config, info_config, total_num, banner_end_time, add_banner, finished_time, display_name, group_sets_no, close_payment_time, confirm_send_time, close_payment_status, open_card, close_payment_record, group_full_time, live_create_time, live_start_time, live_end_time, report_start_time, report_end_time, report_review_num, report_review_first_time, report_review_end_time, review_hold_time, review_approval_time, review_num, config_json, free_flag, mer_name, change_type, act_price, act_config_json, real_sold_num, weight, hot_type, team_first, prop1, prop2, prop3, point_rate, point_max, point_min, list_id, list_code, mix_copies, sub_type, act_point_type, payment_method, payment_total_price, payment_commission, payment_finished_price, payment_remain_price, payment_online_price, exclusive, has_bg, merchant_sort, del_flg, del_time, review_account, act_id, sold_end_time, panini_list_id, hot_type_config, goods_type, report_flag, use_coupon, user_level, custom, gift_card_id, group_show_name, min_card_num, act_type, waring_type, compensation_status, point_type, first_act_config, gift_config, version, extra_prop, use_member_discount, merchant_open, is_deleted FROM (SELECT * FROM ods.ods_trd_card_group_info_ful_d WHERE dt = '${pdt}') f LEFT ANTI JOIN ( SELECT id FROM ods.ods_trd_card_group_info_inc_d WHERE dt = '${dt}' ) i ON f.id = i.id UNION ALL -- 今日变了的(含今日新建) SELECT id, merchant_id, appid, name, code, status, specs, type, random_type, total_price, copies, unit_price, sold_copies, release_time, cycle, show_applet, title, msg, remark, create_time, update_by, update_time, order_quota_min, order_quota_max, user_quota_max, start_time, marketing_info, reviewmsg, `lock`, commission_rate, year, sport, manufacturer, sets, act, config, info_config, total_num, banner_end_time, add_banner, finished_time, display_name, group_sets_no, close_payment_time, confirm_send_time, close_payment_status, open_card, close_payment_record, group_full_time, live_create_time, live_start_time, live_end_time, report_start_time, report_end_time, report_review_num, report_review_first_time, report_review_end_time, review_hold_time, review_approval_time, review_num, config_json, free_flag, mer_name, change_type, act_price, act_config_json, real_sold_num, weight, hot_type, team_first, prop1, prop2, prop3, point_rate, point_max, point_min, list_id, list_code, mix_copies, sub_type, act_point_type, payment_method, payment_total_price, payment_commission, payment_finished_price, payment_remain_price, payment_online_price, exclusive, has_bg, merchant_sort, del_flg, del_time, review_account, act_id, sold_end_time, panini_list_id, hot_type_config, goods_type, report_flag, use_coupon, user_level, custom, gift_card_id, group_show_name, min_card_num, act_type, waring_type, compensation_status, point_type, first_act_config, gift_config, version, extra_prop, use_member_discount, merchant_open, is_deleted FROM ods.ods_trd_card_group_info_inc_d WHERE dt = '${dt}'; -- 保留 2 天:drop 掉 ${dt}-2(T-3)这一个分区 ALTER TABLE ods.ods_trd_card_group_info_ful_d DROP IF EXISTS PARTITION (dt='${rdt}');