00956_sensitive_data_masking is still flacky even after #13748 [1].
[1]: https://clickhouse-test-reports.s3.yandex.net/10373/348ef1256ea8fb8f61109c33bbdd28daf46bdc8e/functional_stateless_tests_(debug).html#fail1
The problem is that it uses the following pattern:
clickhouse-client -q ... & # run some query in background
clickhouse-client -q 'show processlist' > log
grep background-query log
But there is no guarantee that the query in background will be executed before `show processlist`:
2020.08.18 02:52:47.916386 [ 26788 ] {98c36d38-f710-4dfb-af8f-61906abc163c} <Debug> executeQuery: (from [::1]:51650) SHOW PROCESSLIST
...
2020.08.18 02:52:47.926854 [ 26756 ] {086c64fa-713b-4f8c-b702-23bfea10a49c} <Debug> executeQuery: (from [::1]:51652) select count() from system.numbers where ignore('find_me_[hidden]')=0 and ignore('fwerkh_that_magic_string_make_me_unique') = 0 FORMAT Null
Fix the test by waiting until the query in backgroud will start, and use
limited numbers + sleepEachRow over system.numbers to reduce CPU usage.
With default index_granularity=8096 CH always reads at least that number
of rows per selected part, but limit is checked afterwards. The optimization
that interrupts execution of queries based on approx number of rows to read
breaks the test. This means that test case is potetntially contains incorrect
limits.
* Experiment with start/stop in stress test
* Support other installation options in "clickhouse start"
* Better diagnostics in install script
* Fixup
* Fixup
* Better diagnostics in stress test
* Update run.sh
* translate [select] section into Chinese to improve readability
* trigger ci
Co-authored-by: mikepop7 <>
Co-authored-by: Ivan Blinkov <github@blinkov.ru>
* add EN description
* changes after review
* add RU version
* Update docs/en/operations/settings/settings.md
Co-authored-by: Ivan Blinkov <github@blinkov.ru>
* En docs for groupArraySample function.
* Bug fixed.
* Update docs/en/sql-reference/aggregate-functions/reference/grouparraysample.md
Co-authored-by: Olga Revyakina <revolg@yandex-team.ru>
Co-authored-by: Ivan Blinkov <github@blinkov.ru>
