thevar1able/ClickHouse
1
0
Fork 0
mirror of https://github.com/ClickHouse/ClickHouse.git synced 2024-11-26 17:41:59 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fix non-deterministic result of "uniq" aggregate function in extreme rare cases

Browse Source
This commit is contained in:
Alexey Milovidov 2019-07-18 23:21:24 +03:00
parent 71eed6507e
commit 268854d14e
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
dbms/src/AggregateFunctions/UniquesHashSet.h
View File

@ -146,6 +146,19 @@ private:
reinsertImpl(x);
}
}
/** We must process first collision resolution chain once again.
* Look at the comment in "resize" function.
*/
for (size_t i = 0; i < buf_size() && buf[i]; ++i)
{
if (unlikely(i != place(buf[i])))
{
HashValue x = buf[i];
buf[i] = 0;
reinsertImpl(x);
}
}
}
/// Increase the size of the buffer 2 times or up to new_size_degree, if it is non-zero.