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You can also peruse [ClickHouse Events](https://clickhouse.com/company/news-events) for a list of all upcoming trainings, meetups, speaking engagements, etc.
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Upcoming meetups
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*[Austin Meetup](https://www.meetup.com/clickhouse-austin-user-group/events/307289908) - May 13, 2025
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*[London Meetup](https://www.meetup.com/clickhouse-london-user-group/events/306047172/) - May 14, 2025
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*[Istanbul Meetup](https://www.meetup.com/clickhouse-turkiye-meetup-group/events/306978337/) - May 15, 2025
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*[Shenzhen Meetup](https://www.huodongxing.com/event/7803892350511) - May 17, 2025
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*[Belgium Meetup](https://www.meetup.com/clickhouse-belgium-user-group/events/307818346/) - May 20, 2025
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*[Seattle Meetup](https://www.meetup.com/clickhouse-seattle-user-group/events/307622716/) - May 20, 2025
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*[Tokyo Meetup](https://www.meetup.com/clickhouse-tokyo-user-group/events/307689645/) - June 5, 2025
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*[Cyprus Meetup](https://www.meetup.com/clickhouse-cyprus-user-group/events/307819236) - June 10, 2025
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*[Washington DC Meetup](https://www.meetup.com/clickhouse-dc-user-group/events/307622954/) - June 12, 2025
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*[Tel Aviv Meetup](https://www.meetup.com/clickhouse-meetup-israel/events/307820741/) - June 17, 2025
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*[Atlanta Meetup](https://www.meetup.com/clickhouse-atlanta-meetup-group/events/307627590/) - July 8, 2025
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*[New York Meetup](https://www.meetup.com/clickhouse-new-york-user-group/events/307627675/) - July 15, 2025
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Recent meetups
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*[Austin Meetup](https://www.meetup.com/clickhouse-austin-user-group/events/307289908) - May 13, 2025
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*[Denver Meetup](https://www.meetup.com/clickhouse-denver-user-group/events/306934991/) - April 23, 2025
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*[Jakarta Meetup with AWS](https://www.meetup.com/clickhouse-indonesia-user-group/events/306973747/) - April 22, 2025
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*[Kuala Lumper Meetup with CNCF](https://www.meetup.com/clickhouse-malaysia-meetup-group/events/306697678/) - April 16, 2025
### ClickHouse release v25.4.4.25-stable (c97f6ffeac6) FIXME as compared to v25.4.3.22-stable (f23535c7722)
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#### Bug Fix (user-visible misbehavior in an official stable release)
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* Backported in [#79981](https://github.com/ClickHouse/ClickHouse/issues/79981): Fix deserialization of variant discriminators with basic format in compact parts. It was introduced in https://github.com/ClickHouse/ClickHouse/pull/55518. [#79000](https://github.com/ClickHouse/ClickHouse/pull/79000) ([Pavel Kruglov](https://github.com/Avogar)).
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* Backported in [#79715](https://github.com/ClickHouse/ClickHouse/issues/79715): Fix using incorrect paths when renaming an Atomic database. [#79569](https://github.com/ClickHouse/ClickHouse/pull/79569) ([Tuan Pham Anh](https://github.com/tuanpach)).
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* Backported in [#80049](https://github.com/ClickHouse/ClickHouse/issues/80049): Fixes the result of SQL function `formatDateTime` if a variable-size formatter (e.g. `%W` aka. weekday `Monday``Tuesday`, etc.) is followed by a compound formatter (a formatter that prints multiple components at once, e.g. `%D` aka. the American date `05/04/25`). [#79835](https://github.com/ClickHouse/ClickHouse/pull/79835) ([Robert Schulze](https://github.com/rschu1ze)).
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* Backported in [#80113](https://github.com/ClickHouse/ClickHouse/issues/80113): IcebergS3 supports count optimization, but IcebergS3Cluster does not. As a result, the count() result returned in cluster mode may be a multiple of the number of replicas. [#79844](https://github.com/ClickHouse/ClickHouse/pull/79844) ([wxybear](https://github.com/wxybear)).
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* Backported in [#80078](https://github.com/ClickHouse/ClickHouse/issues/80078): Allow materialized views with UNIONs to work correctly on new replicas. [#80037](https://github.com/ClickHouse/ClickHouse/pull/80037) ([Samay Sharma](https://github.com/samay-sharma)).
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* Backported in [#80185](https://github.com/ClickHouse/ClickHouse/issues/80185): Fix warnings `Cannot find 'kernel' in '[...]/memory.stat'` in ClickHouse's log (issue [#77410](https://github.com/ClickHouse/ClickHouse/issues/77410)). [#80129](https://github.com/ClickHouse/ClickHouse/pull/80129) ([Robert Schulze](https://github.com/rschu1ze)).
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#### NOT FOR CHANGELOG / INSIGNIFICANT
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* Backported in [#79811](https://github.com/ClickHouse/ClickHouse/issues/79811): Better introspection for index analysis performance. [#79347](https://github.com/ClickHouse/ClickHouse/pull/79347) ([Nikita Taranov](https://github.com/nickitat)).
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* Backported in [#80222](https://github.com/ClickHouse/ClickHouse/issues/80222): Make test_check_replicated_does_not_block_shutdown less flaky and faster. [#79552](https://github.com/ClickHouse/ClickHouse/pull/79552) ([Raúl Marín](https://github.com/Algunenano)).
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* Backported in [#80099](https://github.com/ClickHouse/ClickHouse/issues/80099): `enable_user_name_access_type` must not affect `DEFINER` access type. [#80026](https://github.com/ClickHouse/ClickHouse/pull/80026) ([pufit](https://github.com/pufit)).
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* Backported in [#80202](https://github.com/ClickHouse/ClickHouse/issues/80202): Disable CPU overload checks for all tests. [#80166](https://github.com/ClickHouse/ClickHouse/pull/80166) ([Alexander Gololobov](https://github.com/davenger)).
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* Backported in [#80230](https://github.com/ClickHouse/ClickHouse/issues/80230): Disable CPU overload check in server settings by default. [#80211](https://github.com/ClickHouse/ClickHouse/pull/80211) ([Alexander Gololobov](https://github.com/davenger)).
-`code` ([Int32](../../sql-reference/data-types/int-uint.md)) — Code number of the error.
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-`error` ([LowCardinality(String)](../../sql-reference/data-types/string.md)) - Name of the error.
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-`last_error_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — The time when the last error happened.
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-`last_error_message` ([String](../../sql-reference/data-types/string.md)) — Message for the last error.
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-`value` ([UInt64](../../sql-reference/data-types/int-uint.md)) — The number of times this error happened.
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-`remote` ([UInt8](../../sql-reference/data-types/int-uint.md)) — Remote exception (i.e. received during one of the distributed queries).
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-`last_error_query_id` ([String](../../sql-reference/data-types/string.md)) — Id of a query that caused the last error (if available).
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-`last_error_trace` ([Array(UInt64)](../../sql-reference/data-types/array.md)) — A stack trace that represents a list of physical addresses where the called methods are stored.
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-`last_error_symbols` ([Array(LowCardinality(String))](../../sql-reference/data-types/array.md)), If the symbolization is enabled, contains demangled symbol names, corresponding to the `last_error_trace`.
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-`last_error_lines` ([Array(LowCardinality(String))](../../sql-reference/data-types/array.md)), If the symbolization is enabled, contains strings with file names with line numbers, corresponding to the `last_error_trace`.
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The symbolization can be enabled or disabled in the `symbolize` under `error_log` in the server's configuration file.
Copy file name to clipboardExpand all lines: docs/en/operations/system-tables/errors.md
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-`last_error_message` ([String](../../sql-reference/data-types/string.md)) — message for the last error.
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-`last_error_trace` ([Array(UInt64)](../../sql-reference/data-types/array.md)) — A [stack trace](https://en.wikipedia.org/wiki/Stack_trace) that represents a list of physical addresses where the called methods are stored.
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-`remote` ([UInt8](../../sql-reference/data-types/int-uint.md)) — remote exception (i.e. received during one of the distributed queries).
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-`last_error_query_id` ([String](../../sql-reference/data-types/string.md)) — Id of a query that caused the last error (if available).
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-`last_error_symbols` ([Array(LowCardinality(String))](../../sql-reference/data-types/array.md)) — Contains demangled symbol names, corresponding to the `last_error_trace`.
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-`last_error_lines` ([Array(LowCardinality(String))](../../sql-reference/data-types/array.md)) — Contains strings with file names with line numbers, corresponding to the `last_error_trace`.
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:::note
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Counters for some errors may increase during successful query execution. It's not recommended to use this table for server monitoring purposes unless you are sure that corresponding error can not be a false positive.
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