mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-05 15:21:43 +00:00
10 lines
418 B
MySQL
10 lines
418 B
MySQL
|
-- for small cardinality the 64 bit hash perform worse, but for 1e10:
|
||
|
|
-- 4 byte hash: 2.8832809652e10
|
||
|
|
-- 8 byte hash: 0.9998568925e10
|
||
|
|
-- but hence checking with 1e10 values takes too much time (~45 secs), this
|
||
|
|
-- test is just to ensure that the result is different (and to document the
|
||
|
|
-- outcome).
|
||
|
|
|
||
|
|
SELECT uniqCombined(number) FROM numbers(toUInt64(1e7));
|
||
|
|
SELECT uniqCombined64(number) FROM numbers(toUInt64(1e7));
|