mirror of
https://github.com/ClickHouse/ClickHouse.git
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166 lines
4.1 KiB
SQL
166 lines
4.1 KiB
SQL
DROP TABLE IF EXISTS codecTest;
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CREATE TABLE codecTest (
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key UInt64,
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ref_valueU64 UInt64,
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ref_valueU32 UInt32,
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ref_valueU16 UInt16,
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ref_valueU8 UInt8,
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ref_valueI64 Int64,
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ref_valueI32 Int32,
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ref_valueI16 Int16,
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ref_valueI8 Int8,
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ref_valueDT DateTime,
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ref_valueD Date,
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valueU64 UInt64 CODEC(DoubleDelta),
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valueU32 UInt32 CODEC(DoubleDelta),
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valueU16 UInt16 CODEC(DoubleDelta),
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valueU8 UInt8 CODEC(DoubleDelta),
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valueI64 Int64 CODEC(DoubleDelta),
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valueI32 Int32 CODEC(DoubleDelta),
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valueI16 Int16 CODEC(DoubleDelta),
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valueI8 Int8 CODEC(DoubleDelta),
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valueDT DateTime CODEC(DoubleDelta),
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valueD Date CODEC(DoubleDelta)
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) Engine = MergeTree ORDER BY key;
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-- checking for overflow
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INSERT INTO codecTest (key, ref_valueU64, valueU64, ref_valueI64, valueI64)
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VALUES (1, 18446744073709551615, 18446744073709551615, 9223372036854775807, 9223372036854775807), (2, 0, 0, -9223372036854775808, -9223372036854775808), (3, 18446744073709551615, 18446744073709551615, 9223372036854775807, 9223372036854775807);
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-- n^3 covers all double delta storage cases, from small difference between neighbouref_values (stride) to big.
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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)
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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)
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FROM system.numbers LIMIT 101, 1000;
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-- best case - constant stride
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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)
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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)
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FROM system.numbers LIMIT 2001, 1000;
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-- worst case - random stride
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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)
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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)
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FROM system.numbers LIMIT 3001, 1000;
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SELECT 'U64';
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SELECT
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key,
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ref_valueU64, valueU64, ref_valueU64 - valueU64 as dU64
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FROM codecTest
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WHERE
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dU64 != 0
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LIMIT 10;
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SELECT 'U32';
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SELECT
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key,
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ref_valueU32, valueU32, ref_valueU32 - valueU32 as dU32
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FROM codecTest
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WHERE
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dU32 != 0
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LIMIT 10;
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SELECT 'U16';
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SELECT
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key,
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ref_valueU16, valueU16, ref_valueU16 - valueU16 as dU16
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FROM codecTest
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WHERE
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dU16 != 0
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LIMIT 10;
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SELECT 'U8';
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SELECT
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key,
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ref_valueU8, valueU8, ref_valueU8 - valueU8 as dU8
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FROM codecTest
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WHERE
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dU8 != 0
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LIMIT 10;
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SELECT 'I64';
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SELECT
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key,
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ref_valueI64, valueI64, ref_valueI64 - valueI64 as dI64
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FROM codecTest
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WHERE
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dI64 != 0
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LIMIT 10;
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SELECT 'I32';
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SELECT
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key,
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ref_valueI32, valueI32, ref_valueI32 - valueI32 as dI32
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FROM codecTest
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WHERE
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dI32 != 0
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LIMIT 10;
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SELECT 'I16';
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SELECT
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key,
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ref_valueI16, valueI16, ref_valueI16 - valueI16 as dI16
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FROM codecTest
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WHERE
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dI16 != 0
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LIMIT 10;
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SELECT 'I8';
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SELECT
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key,
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ref_valueI8, valueI8, ref_valueI8 - valueI8 as dI8
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FROM codecTest
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WHERE
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dI8 != 0
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LIMIT 10;
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SELECT 'DT';
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SELECT
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key,
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ref_valueDT, valueDT, ref_valueDT - valueDT as dDT
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FROM codecTest
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WHERE
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dDT != 0
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LIMIT 10;
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SELECT 'D';
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SELECT
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key,
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ref_valueD, valueD, ref_valueD - valueD as dD
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FROM codecTest
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WHERE
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dD != 0
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LIMIT 10;
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SELECT 'Compression:';
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SELECT
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table, name, type,
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compression_codec,
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data_uncompressed_bytes u,
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data_compressed_bytes c,
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round(u/c,3) ratio
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FROM system.columns
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WHERE
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table == 'codecTest'
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AND
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compression_codec != ''
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AND
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ratio <= 1
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ORDER BY
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table, name, type;
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DROP TABLE IF EXISTS codecTest;
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