ClickHouse/tests/queries/0_stateless/00950_test_double_delta_codec.sql

DROP TABLE IF EXISTS codecTest;

CREATE TABLE codecTest (
    key      UInt64,
    ref_valueU64 UInt64,
    ref_valueU32 UInt32,
    ref_valueU16 UInt16,
    ref_valueU8  UInt8,
    ref_valueI64 Int64,
    ref_valueI32 Int32,
    ref_valueI16 Int16,
    ref_valueI8  Int8,
    ref_valueDT  DateTime,
    ref_valueD   Date,
    valueU64 UInt64   CODEC(DoubleDelta),
    valueU32 UInt32   CODEC(DoubleDelta),
    valueU16 UInt16   CODEC(DoubleDelta),
    valueU8  UInt8    CODEC(DoubleDelta),
    valueI64 Int64    CODEC(DoubleDelta),
    valueI32 Int32    CODEC(DoubleDelta),
    valueI16 Int16    CODEC(DoubleDelta),
    valueI8  Int8     CODEC(DoubleDelta),
    valueDT  DateTime CODEC(DoubleDelta),
    valueD   Date     CODEC(DoubleDelta)
) Engine = MergeTree ORDER BY key SETTINGS min_bytes_for_wide_part = 0;


-- checking for overflow
INSERT INTO codecTest (key, ref_valueU64, valueU64, ref_valueI64, valueI64)
    VALUES (1, 18446744073709551615, 18446744073709551615, 9223372036854775807, 9223372036854775807), (2, 0, 0, -9223372036854775808, -9223372036854775808), (3, 18446744073709551615, 18446744073709551615, 9223372036854775807, 9223372036854775807);

-- n^3 covers all double delta storage cases, from small difference between neighbouref_values (stride) to big.
INSERT INTO codecTest (key, ref_valueU64, valueU64, ref_valueU32, valueU32, ref_valueU16, valueU16, ref_valueU8, valueU8, ref_valueI64, valueI64, ref_valueI32, valueI32, ref_valueI16, valueI16, ref_valueI8, valueI8, ref_valueDT, valueDT, ref_valueD, valueD)
    SELECT number as n, n * n * n as v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, toDateTime(v), toDateTime(v), toDate(v), toDate(v)
    FROM system.numbers LIMIT 101, 1000;

-- best case - constant stride
INSERT INTO codecTest (key, ref_valueU64, valueU64, ref_valueU32, valueU32, ref_valueU16, valueU16, ref_valueU8, valueU8, ref_valueI64, valueI64, ref_valueI32, valueI32, ref_valueI16, valueI16, ref_valueI8, valueI8, ref_valueDT, valueDT, ref_valueD, valueD)
    SELECT number as n, n as v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, toDateTime(v), toDateTime(v), toDate(v), toDate(v)
    FROM system.numbers LIMIT 2001, 1000;


-- worst case - random stride
INSERT INTO codecTest (key, ref_valueU64, valueU64, ref_valueU32, valueU32, ref_valueU16, valueU16, ref_valueU8, valueU8, ref_valueI64, valueI64, ref_valueI32, valueI32, ref_valueI16, valueI16, ref_valueI8, valueI8, ref_valueDT, valueDT, ref_valueD, valueD)
    SELECT number as n, n + (rand64() - 9223372036854775807)/1000 as v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, v, toDateTime(v), toDateTime(v), toDate(v), toDate(v)
    FROM system.numbers LIMIT 3001, 1000;


SELECT 'U64';
SELECT
    key,
    ref_valueU64, valueU64, ref_valueU64 - valueU64 as dU64
FROM codecTest
WHERE
    dU64 != 0
LIMIT 10;


SELECT 'U32';
SELECT
    key,
    ref_valueU32, valueU32, ref_valueU32 - valueU32 as dU32
FROM codecTest
WHERE
    dU32 != 0
LIMIT 10;


SELECT 'U16';
SELECT
    key,
    ref_valueU16, valueU16, ref_valueU16 - valueU16 as dU16
FROM codecTest
WHERE
    dU16 != 0
LIMIT 10;


SELECT 'U8';
SELECT
    key,
    ref_valueU8, valueU8, ref_valueU8 - valueU8 as dU8
FROM codecTest
WHERE
    dU8 != 0
LIMIT 10;


SELECT 'I64';
SELECT
    key,
    ref_valueI64, valueI64, ref_valueI64 - valueI64 as dI64
FROM codecTest
WHERE
    dI64 != 0
LIMIT 10;


SELECT 'I32';
SELECT
    key,
    ref_valueI32, valueI32, ref_valueI32 - valueI32 as dI32
FROM codecTest
WHERE
    dI32 != 0
LIMIT 10;


SELECT 'I16';
SELECT
    key,
    ref_valueI16, valueI16, ref_valueI16 - valueI16 as dI16
FROM codecTest
WHERE
    dI16 != 0
LIMIT 10;


SELECT 'I8';
SELECT
    key,
    ref_valueI8, valueI8, ref_valueI8 - valueI8 as dI8
FROM codecTest
WHERE
    dI8 != 0
LIMIT 10;


SELECT 'DT';
SELECT
    key,
    ref_valueDT, valueDT, ref_valueDT - valueDT as dDT
FROM codecTest
WHERE
    dDT != 0
LIMIT 10;


SELECT 'D';
SELECT
    key,
    ref_valueD, valueD, ref_valueD - valueD as dD
FROM codecTest
WHERE
    dD != 0
LIMIT 10;

SELECT 'Compression:';
SELECT
    table, name, type,
    compression_codec,
    data_uncompressed_bytes u,
    data_compressed_bytes c,
    round(u/c,3) ratio
FROM system.columns
WHERE
    table = 'codecTest'
    AND database = currentDatabase()
AND
    compression_codec != ''
AND
    ratio <= 1
ORDER BY
    table, name, type;

DROP TABLE IF EXISTS codecTest;