2 Commits

Author	SHA1	Message	Date
Alexey Milovidov	d3a8faee16	Fixed test reference file for aggregate function topK [#CLICKHOUSE-3].	2017-05-12 23:59:14 +03:00
Marek Vavruša	5f1e65b252	AggregateFunctions: implemented topK(n) ... This implements a new function for approximate computation of the most frequent entries using Filtered Space Saving with a merge step adapted from Parallel Space Saving paper. It works better for cases where GROUP BY x is impractical due to high cardinality of x, such as top IP addresses or top search queries.	2017-05-03 23:09:52 -07:00