fix(ods): внедрен паттерн Temporary Table для транзакционных загрузок
- Зачем: - исправление критических ошибок P0 (гонка HWM, ошибки в SQL CTE, непоследовательный lineage). - использование временных таблиц делает код более читаемым для студентов и производительным для Greenplum. - Что: - в sql/ods/ (bookings, tickets, segments, boarding_passes, flights) выборка дельты вынесена в CREATE TEMP TABLE. - HWM теперь вычисляется один раз, устраняя гонку между UPDATE и INSERT. - во всех стейтментах используется оригинальный batch_id из STG для _load_id. - поле _load_ts в ODS теперь берется из STG (load_dttm), что делает HWM-сравнение корректным. - Проверка: - визуальный аудит SQL-логики.
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+26
-89
@@ -1,9 +1,11 @@
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-- Загрузка ODS по flights: SCD1 (UPDATE изменившихся + INSERT новых).
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-- Используем паттерн Temporary Table для предотвращения гонки HWM между UPDATE и INSERT.
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-- Statement 1: UPDATE существующих строк.
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-- 1. Сбор дельты во временную таблицу.
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CREATE TEMP TABLE tmp_flights_delta ON COMMIT DROP AS
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WITH segment_flights AS (
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-- В segments текущего batch могут быть flight_id не только из stg.flights этого batch.
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-- Поэтому заранее собираем список flight_id из segments текущего batch.
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-- Поэтому заранее собираем список flight_id из segments текущего batch (по HWM).
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SELECT DISTINCT
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NULLIF(s.flight_id, '')::INTEGER AS flight_id
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FROM stg.segments AS s
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@@ -28,7 +30,7 @@ stg_flights_typed AS (
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AND s.flight_id <> ''
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),
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src_union AS (
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-- 1) Рейсы из текущего batch.
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-- 1) Рейсы из текущего batch (по HWM).
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SELECT
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f.flight_id,
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f.route_no,
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@@ -38,7 +40,8 @@ src_union AS (
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f.actual_departure,
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f.actual_arrival,
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f.event_ts,
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f.load_dttm
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f.load_dttm,
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f.batch_id
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FROM stg_flights_typed AS f
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WHERE f.load_dttm > (SELECT COALESCE(MAX(_load_ts), '1900-01-01 00:00:00'::TIMESTAMP) FROM ods.flights)
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@@ -54,7 +57,8 @@ src_union AS (
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f.actual_departure,
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f.actual_arrival,
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f.event_ts,
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f.load_dttm
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f.load_dttm,
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f.batch_id
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FROM stg_flights_typed AS f
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JOIN segment_flights AS sf
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ON sf.flight_id = f.flight_id
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@@ -69,12 +73,17 @@ src AS (
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u.actual_departure,
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u.actual_arrival,
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u.event_ts,
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u.batch_id,
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u.load_dttm,
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ROW_NUMBER() OVER (
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PARTITION BY u.flight_id
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ORDER BY u.event_ts DESC NULLS LAST, u.load_dttm DESC
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) AS rn
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FROM src_union AS u
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)
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SELECT * FROM src WHERE rn = 1;
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-- 2. UPDATE существующих строк.
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UPDATE ods.flights AS o
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SET route_no = s.route_no,
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status = s.status,
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@@ -83,11 +92,10 @@ SET route_no = s.route_no,
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actual_departure = s.actual_departure,
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actual_arrival = s.actual_arrival,
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event_ts = s.event_ts,
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_load_id = '{{ ti.xcom_pull(task_ids="resolve_stg_batch_id") }}'::text,
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_load_ts = now()
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FROM src AS s
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WHERE s.rn = 1
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AND o.flight_id = s.flight_id
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_load_id = s.batch_id, -- Сохраняем оригинальный lineage из STG
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_load_ts = s.load_dttm -- Фиксируем время STG как водяной знак для ODS
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FROM tmp_flights_delta AS s
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WHERE o.flight_id = s.flight_id
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AND (
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o.route_no IS DISTINCT FROM s.route_no
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OR o.status IS DISTINCT FROM s.status
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@@ -98,77 +106,7 @@ WHERE s.rn = 1
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OR o.event_ts IS DISTINCT FROM s.event_ts
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);
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-- Statement 2: INSERT новых строк.
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WITH segment_flights AS (
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SELECT DISTINCT
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NULLIF(s.flight_id, '')::INTEGER AS flight_id
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FROM stg.segments AS s
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WHERE s.load_dttm > (SELECT COALESCE(MAX(_load_ts), '1900-01-01 00:00:00'::TIMESTAMP) FROM ods.segments)
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AND s.flight_id IS NOT NULL
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AND s.flight_id <> ''
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),
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stg_flights_typed AS (
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SELECT
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NULLIF(s.flight_id, '')::INTEGER AS flight_id,
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s.route_no,
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s.status,
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NULLIF(s.scheduled_departure, '')::TIMESTAMP WITH TIME ZONE AS scheduled_departure,
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NULLIF(s.scheduled_arrival, '')::TIMESTAMP WITH TIME ZONE AS scheduled_arrival,
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NULLIF(s.actual_departure, '')::TIMESTAMP WITH TIME ZONE AS actual_departure,
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NULLIF(s.actual_arrival, '')::TIMESTAMP WITH TIME ZONE AS actual_arrival,
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s.src_created_at_ts AS event_ts,
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s.load_dttm,
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s.batch_id
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FROM stg.flights AS s
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WHERE s.flight_id IS NOT NULL
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AND s.flight_id <> ''
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),
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src_union AS (
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SELECT
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f.flight_id,
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f.route_no,
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f.status,
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f.scheduled_departure,
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f.scheduled_arrival,
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f.actual_departure,
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f.actual_arrival,
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f.event_ts,
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f.load_dttm
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FROM stg_flights_typed AS f
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WHERE f.load_dttm > (SELECT COALESCE(MAX(_load_ts), '1900-01-01 00:00:00'::TIMESTAMP) FROM ods.flights)
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UNION ALL
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SELECT
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f.flight_id,
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f.route_no,
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f.status,
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f.scheduled_departure,
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f.scheduled_arrival,
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f.actual_departure,
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f.actual_arrival,
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f.event_ts,
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f.load_dttm
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FROM stg_flights_typed AS f
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JOIN segment_flights AS sf
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ON sf.flight_id = f.flight_id
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),
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src AS (
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SELECT
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u.flight_id,
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u.route_no,
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u.status,
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u.scheduled_departure,
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u.scheduled_arrival,
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u.actual_departure,
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u.actual_arrival,
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u.event_ts,
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ROW_NUMBER() OVER (
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PARTITION BY u.flight_id
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ORDER BY u.event_ts DESC NULLS LAST, u.load_dttm DESC
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) AS rn
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FROM src_union AS u
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)
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-- 3. INSERT новых строк.
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INSERT INTO ods.flights (
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flight_id,
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route_no,
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@@ -191,13 +129,12 @@ SELECT
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s.actual_arrival,
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s.event_ts,
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s.batch_id,
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now()
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FROM src AS s
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WHERE s.rn = 1
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AND NOT EXISTS (
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SELECT 1
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FROM ods.flights AS o
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WHERE o.flight_id = s.flight_id
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);
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s.load_dttm
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FROM tmp_flights_delta AS s
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WHERE NOT EXISTS (
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SELECT 1
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FROM ods.flights AS o
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WHERE o.flight_id = s.flight_id
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);
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ANALYZE ods.flights;
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