DROP TABLE IF EXISTS tab_00625;

CREATE TABLE tab_00625
(
    date Date,
    key UInt32,
    testMap Nested(
    k UInt16,
    v UInt64)
)
ENGINE = SummingMergeTree(date, (date, key), 1);

INSERT INTO tab_00625 SELECT
    today(),
    number,
    [toUInt16(number)],
    [number]
FROM system.numbers
LIMIT 8190;

INSERT INTO tab_00625 SELECT
    today(),
    number + 8190,
    [toUInt16(number)],
    [number + 8190]
FROM system.numbers
LIMIT 10;

OPTIMIZE TABLE tab_00625;

DROP TABLE tab_00625;