priv/data_migrations/PopulateEventSessionColumns/sql/get-mutations-progress.sql.eex

SELECT
    total,
    length(parts_to_do_names),
    running_for_seconds,
    formatReadableSize(total_bytes),
    formatReadableSize(todo_bytes),
    round(100 - todo_bytes / total_bytes * 100, 2),
    latest_fail_reason,
    sum(part.bytes_on_disk) as total_bytes,
    sumIf(part.bytes_on_disk, has(parts_to_do_names, part.name)) AS todo_bytes
FROM (
    SELECT count() AS total,
        groupArrayArray(parts_to_do_names) AS parts_to_do_names,
        now() - min(create_time) AS running_for_seconds,
        anyIf(latest_fail_reason, latest_fail_reason != '') AS latest_fail_reason
    FROM system.mutations
    WHERE not is_done
    AND table = 'events_v2'
    AND command ILIKE '%sessions_dict%'
) AS mut
CROSS JOIN (
    SELECT name, bytes_on_disk
    FROM system.parts
    WHERE table = 'events_v2'
    AND active
    AND partition >= '<%= @min_partition %>'
    AND partition <= '<%= @max_partition %>'
) AS part
GROUP BY mut.total, mut.parts_to_do_names, mut.running_for_seconds, mut.latest_fail_reason