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https://github.com/ClickHouse/ClickHouse.git
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62 lines
1.8 KiB
SQL
62 lines
1.8 KiB
SQL
DROP TABLE IF EXISTS codecTest;
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CREATE TABLE codecTest (
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key UInt64,
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name String,
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ref_valueF64 Float64,
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ref_valueF32 Float32,
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valueF64 Float64 CODEC(Gorilla),
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valueF32 Float32 CODEC(Gorilla)
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) Engine = MergeTree ORDER BY key;
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-- best case - same value
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INSERT INTO codecTest (key, name, ref_valueF64, valueF64, ref_valueF32, valueF32)
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SELECT number AS n, 'e()', e() AS v, v, v, v FROM system.numbers LIMIT 1, 100;
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-- good case - values that grow insignificantly
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INSERT INTO codecTest (key, name, ref_valueF64, valueF64, ref_valueF32, valueF32)
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SELECT number AS n, 'log2(n)', log2(n) AS v, v, v, v FROM system.numbers LIMIT 101, 100;
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-- bad case - values differ significantly
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INSERT INTO codecTest (key, name, ref_valueF64, valueF64, ref_valueF32, valueF32)
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SELECT number AS n, 'n*sqrt(n)', n*sqrt(n) AS v, v, v, v FROM system.numbers LIMIT 201, 100;
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-- worst case - almost like a random values
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INSERT INTO codecTest (key, name, ref_valueF64, valueF64, ref_valueF32, valueF32)
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SELECT number AS n, 'sin(n*n*n)*n', sin(n * n * n * n* n) AS v, v, v, v FROM system.numbers LIMIT 301, 100;
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-- These floating-point values are expected to be BINARY equal, so comparing by-value is Ok here.
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-- referencing previous row key, value, and case name to simplify debugging.
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SELECT 'F64';
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SELECT
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c1.key, c1.name,
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c1.ref_valueF64, c1.valueF64, c1.ref_valueF64 - c1.valueF64 AS dF64,
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'prev:',
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c2.key, c2.ref_valueF64
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FROM
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codecTest as c1, codecTest as c2
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WHERE
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dF64 != 0
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AND
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c2.key = c1.key - 1
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LIMIT 10;
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SELECT 'F32';
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SELECT
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c1.key, c1.name,
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c1.ref_valueF32, c1.valueF32, c1.ref_valueF32 - c1.valueF32 AS dF32,
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'prev:',
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c2.key, c2.ref_valueF32
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FROM
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codecTest as c1, codecTest as c2
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WHERE
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dF32 != 0
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AND
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c2.key = c1.key - 1
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LIMIT 10;
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DROP TABLE IF EXISTS codecTest;
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