Fastest number series generator challenge.
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DROP TABLE IF EXISTS dbo.CSBits; | |
CREATE TABLE dbo.CSBits (b BIT NOT NULL); | |
CREATE CLUSTERED COLUMNSTORE INDEX Idx_cci_CSBits | |
ON dbo.CSBits | |
WITH (DATA_COMPRESSION = COLUMNSTORE_ARCHIVE ); | |
--Populate with 4294967296 rows. | |
INSERT INTO dbo.CSBits (b) | |
SELECT TOP(1048576) 0 | |
FROM master..spt_values v1 | |
CROSS JOIN master..spt_values v2 | |
GO 4096 | |
CREATE OR ALTER FUNCTION dbo.GetNumsDaveMason_CSBits(@low AS BIGINT, @high AS BIGINT) | |
RETURNS TABLE | |
AS | |
RETURN | |
SELECT TOP(@high - @low + 1) | |
ROW_NUMBER() OVER (ORDER BY (SELECT NULL)) + (@low - 1) AS n | |
FROM dbo.CSBits | |
ORDER BY 1; | |
GO | |
--CPU time = 8078 ms, elapsed time = 9702 ms. | |
--CPU time = 8453 ms, elapsed time = 9828 ms. | |
--CPU time = 8437 ms, elapsed time = 9745 ms. | |
SELECT n | |
FROM dbo.GetNumsDaveMason_CSBits(1, 100000000) | |
OPTION(MAXDOP 1); |
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