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2022 Changelog
ClickHouse release v21.4.4.30-stable FIXME as compared to v21.4.3.21-stable
Backward Incompatible Change
- Backported in #23145: Now replicas that are processing the
ALTER TABLE ATTACH PART[ITION]
command search in theirdetached/
folders before fetching the data from other replicas. As an implementation detail, a new commandATTACH_PART
is introduced in the replicated log. Parts are searched and compared by their checksums. #18978 (Mike Kot).
New Feature
- Backported in #23147: Improved performance of
dictGetHierarchy
,dictIsIn
functions. Added functionsdictGetChildren(dictionary, key)
,dictGetDescendants(dictionary, key, level)
. FunctiondictGetChildren
return all children as an array if indexes. It is a inverse transformation fordictGetHierarchy
. FunctiondictGetDescendants
return all descendants as ifdictGetChildren
was appliedlevel
times recursively. Zerolevel
value is equivalent to infinity. Closes #14656. #22096 (Maksim Kita). - Backported in #23146: Added function
dictGetOrNull
. It works likedictGet
, but returnNull
in case key was not found in dictionary. Closes #22375. #22413 (Maksim Kita).
Improvement
- Backported in #23148: Add aliases
simpleJSONExtract/simpleJSONHas
tovisitParam/visitParamExtract{UInt, Int, Bool, Float, Raw, String}
. Fixes #21383. #21519 (fastio). - Backported in #23016: Set
background_fetches_pool_size
to 8 that is better for production usage with frequent small insertions or slow ZooKeeper cluster. #22945 (Alexey Milovidov). - Backported in #23079: Raised the threshold on max number of matches in result of the function
extractAllGroupsHorizontal
. #23036 (Vasily Nemkov).
Bug Fix
- Backported in #23158: Fixed a bug with unlimited wait for auxiliary AWS requests. #22594 (Vladimir Chebotarev).
- Backported in #23018: fixed
formatDateTime()
onDateTime64
and "%C" format specifier fixedtoDateTime64()
for large values and non-zero scale. ... #22937 (Vasily Nemkov). - Backported in #23031: Fix error
Cannot find column in ActionsDAG result
which may happen if subquery usesuntuple
. Fixes #22290. #22991 (Nikolai Kochetov). - Backported in #23074: Remove non-essential details from suggestions in clickhouse-client. This closes #22158. #23040 (Alexey Milovidov).
- Backported in #23097: Fixed
Table .inner_id... doesn't exist
error when selecting from Materialized View after detaching it from Atomic database and attaching back. #23047 (Alexander Tokmakov). - Backported in #23173: Some values were formatted with alignment in center in table cells in
Markdown
format. Not anymore. #23096 (Alexey Milovidov).
Build/Testing/Packaging Improvement
- Backported in #23149: Enable the bundled openldap on ppc64le ... #22487 (Kfir Itzhak).