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# troubleshootings
Slackbot
01/31/2023, 2:52 AMThis message was deleted.
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Vijay Narayanan
01/31/2023, 3:04 AMtheta skecth is an approximation so the reult will change. However it will give exact cound upto the size of the sketch
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Bharat Thakur
01/31/2023, 4:17 AMHow to determine size of sketch
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Vijay Narayanan
01/31/2023, 4:53 AMAPPROX_COUNT_DISTINCT_DS_THETA(expr, [size])
Vijay Narayanan
01/31/2023, 4:53 AMyou specify the size…larger size will take more memory and disk space
Vijay Narayanan
01/31/2023, 4:54 AMalso error in the estimate depends on size https://datasketches.apache.org/docs/Theta/ThetaErrorTable.html