DROP TABLE IF EXISTS range;

CREATE TABLE range
(
    `id` String,
    `start` UInt64,
    `end` UInt64
)
ENGINE = MergeTree
ORDER BY start;

INSERT INTO range VALUES ('a', 1, 3), ('a', 2, 4), ('a', 5, 6), ('a', 5, 7), ('b', 10, 12), ('b', 13, 19), ('b', 14, 16);

SELECT
    id,
    rangeSum(start, end)
FROM range
GROUP BY id
ORDER BY id;

DROP TABLE range;