Исправился по всем замечаниям

bhabibullin/clickhouse/clickhouse_pet.sql

@@ -86,6 +86,8 @@ ORDER BY (lesson_id, course_id);
     - Дата первого и последнего просмотра
  */
 
+-- Основная таблица с AggregatingMergeTree
+
 CREATE TABLE bhabibullin.lesson_popularity_summary
 ON CLUSTER clickhouse_cluster
 (
@@ -93,18 +95,19 @@ ON CLUSTER clickhouse_cluster
     lesson_title  String,
     course_id     UInt32,
     course_title  String,
-    total_views   UInt32,
-    unique_users  UInt32,
-    first_view    DateTime64(3, 'UTC'),
-    last_view     DateTime64(3, 'UTC')
+    total_views   AggregateFunction(sum, UInt64),
+    unique_users  AggregateFunction(uniq, UInt32),
+    first_view    AggregateFunction(min, DateTime64(3, 'UTC')),
+    last_view     AggregateFunction(max, DateTime64(3, 'UTC'))
 )
-ENGINE = ReplicatedMergeTree(
-	'/clickhouse/tables/{shard}/bhabibullin/lesson_popularity_summary',
-	'{replica}'
+ENGINE = ReplicatedAggregatingMergeTree(
+    '/clickhouse/tables/{shard}/bhabibullin/lesson_popularity_summary',
+    '{replica}'
 )
-ORDER BY (lesson_id, course_id);
+ORDER BY (lesson_id, course_id)
+SETTINGS index_granularity = 8192;
 
-CREATE MATERIALIZED VIEW mv_lesson_popularity_summary
+CREATE MATERIALIZED VIEW bhabibullin.mv_lesson_popularity_summary
 ON CLUSTER clickhouse_cluster
 TO bhabibullin.lesson_popularity_summary
 AS
@@ -113,13 +116,13 @@ SELECT
     l.title AS lesson_title,
     flv.course_id AS course_id,
     c.title AS course_title,
-    count() AS total_views,
-    uniqExact(flv.user_id) AS unique_users,
-    min(flv.viewed_at) AS first_view,
-    max(flv.viewed_at) AS last_view
+    sumState(1) AS total_views,
+    uniqState(flv.user_id) AS unique_users,
+    minState(flv.viewed_at) AS first_view,
+    maxState(flv.viewed_at) AS last_view
 FROM core_fact_lesson_views AS flv
-JOIN core_dim_lesson  AS l ON flv.lesson_id = l.lesson_id
-JOIN core_dim_course  AS c ON flv.course_id = c.course_id
+JOIN core_dim_lesson AS l ON flv.lesson_id = l.lesson_id
+JOIN core_dim_course AS c ON flv.course_id = c.course_id
 GROUP BY
     flv.lesson_id,
     l.title,
@@ -189,21 +192,24 @@ ORDER BY user_id;
 
 CREATE MATERIALIZED VIEW bhabibullin.mv_inactive_users_summary 
 ON CLUSTER clickhouse_cluster
-to bhabibullin.inactive_users_summary 
+TO bhabibullin.inactive_users_summary 
 AS
 SELECT  
     cdu.user_id,
     cdu.name,
     cdu.email,
     cdu.age,
-    0 as enrollment_count,
+    countDistinct(flv.course_id) as enrollment_count,
     cdu.registration_date
 FROM core_dim_user cdu 
-WHERE (cdu.user_id, 1) NOT IN (
-    SELECT user_id, 1 
-    FROM core_enrollments
-    GROUP BY user_id
-);
+LEFT ANTI JOIN core_fact_lesson_views flv 
+    ON cdu.user_id = flv.user_id
+GROUP BY 
+    cdu.user_id,
+    cdu.name,
+    cdu.email,
+    cdu.age,
+    cdu.registration_date;
 
 INSERT INTO bhabibullin.inactive_users_summary
 SELECT