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https://github.com/ClickHouse/ClickHouse.git
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9963e2f160
* Changing size() return type from UInt32 to UInt64 to prevent overflow (this shouldn't break back compatibility). * Removing "big cardinalities fix" for cardinalities >2^32/30 as it was very inaccurate and for estimates >2^32 it was trying to do 'log' of negative number which is NaN and it was casted to 0. * Adding python script to show that intHash32 is not a good choice for HyperLogLog algorithm when it's used for linear counting branch of it. * Adding bash script to test uniq, uniqHLL12, uniqCombined on different set cardinalities. * Altering documentation of uniq* aggregate functions with recommendations to use uniq instead of uniqHLL12 or uniqCombined.
11 lines
254 B
Bash
Executable File
11 lines
254 B
Bash
Executable File
#!/bin/bash
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for ((p = 2; p <= 10; p++))
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do
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for ((i = 1; i <= 9; i++))
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do
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n=$(( 10**p * i ))
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echo -n "$n "
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clickhouse-client -q "select uniqHLL12(number), uniq(number), uniqCombined(number) from numbers($n);"
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done
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done
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