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homework, pet project DE Dmitry_Medvedev #1

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dmitry_medvedev wants to merge 264 commits from md_branch into main
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mnoskov/clickhouse/Пет-проект: Витринный слой/Этап 4. Тестирование и валидация/task_6_compare_data_with_Greenplum.txt
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Разница есть только в таблицах mv_lesson_popularity_summary
Где в Greenplum - NULL, в clickhouse - 0. Потому что clickhouser сам подставляет 0 вместо NULL.