* impl
* stash
* clean up
* do not apply when HT is small
* make branch static
* also in merge
* do not hardcode look ahead value
* fix
* apply to methods with cheap key calculation
* more tests
* silence tidy
* fix build
* support HashMethodKeysFixed
* apply during merge only for cheap
* stash
* fixes
* rename method
* add feature flag
* cache prefetch threshold value
* fix
* fix
* Update HashMap.h
* fix typo
* 256KB as default l2 size
Co-authored-by: Alexey Milovidov <milovidov@clickhouse.com>
New query:
```
WITH ceil(max(q[3]), 1) AS h
SELECT concat('sed -i s\'/^<test.*$/<test max_ignored_relative_change="', toString(h), '">/g\' tests/performance/', test, '.xml') AS s
FROM
(
SELECT
test,
query_index,
count(*),
min(event_time),
max(event_time) AS t,
arrayMap(x -> floor(x, 3), quantiles(0, 0.5, 0.95, 1)(stat_threshold)) AS q,
median(stat_threshold) AS m
FROM perftest.query_metrics
WHERE (metric = 'client_time') AND (abs(diff) < 0.05) AND (old > 0.2)
GROUP BY
test,
query_index,
query_display_name
HAVING (t > '2020-09-01 00:00:00') AND (m > 0.1)
ORDER BY test DESC
)
GROUP BY test
ORDER BY h DESC
FORMAT PrettySpace
```
