mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-27 01:51:59 +00:00
21 lines
595 B
SQL
21 lines
595 B
SQL
SELECT uniqCombined(number)
|
|
FROM numbers(10000)
|
|
GROUP BY number
|
|
WITH TOTALS
|
|
ORDER BY number DESC
|
|
LIMIT 10
|
|
SETTINGS
|
|
/* force aggregates serialization to trigger the issue with */
|
|
max_bytes_before_external_group_by=1,
|
|
/* overflow row: */
|
|
max_rows_to_group_by=10000000000,
|
|
group_by_overflow_mode='any',
|
|
totals_mode='before_having',
|
|
/* this is to account memory under 4MB (for max_bytes_before_external_group_by) to use less rows */
|
|
max_untracked_memory=0,
|
|
group_by_two_level_threshold=10000,
|
|
/* explicitly */
|
|
max_block_size=1000,
|
|
max_threads=1
|
|
;
|