ClickHouse/docs/changelogs/v23.12.3.40-stable.md

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1	2024

2024 Changelog

ClickHouse release v23.12.3.40-stable (a594704ae7) FIXME as compared to v23.12.2.59-stable (17ab210e76)

Improvement

• Backported in #58660: When executing some queries, which require a lot of streams for reading data, the error "Paste JOIN requires sorted tables only" was previously thrown. Now the numbers of streams resize to 1 in that case. #58608 (Yarik Briukhovetskyi).
• Backported in #58817: Add SYSTEM JEMALLOC PURGE for purging unused jemalloc pages, SYSTEM JEMALLOC [ ENABLE | DISABLE | FLUSH ] PROFILE for controlling jemalloc profile if the profiler is enabled. Add jemalloc-related 4LW command in Keeper: jmst for dumping jemalloc stats, jmfp, jmep, jmdp for controlling jemalloc profile if the profiler is enabled. #58665 (Antonio Andelic).
• Backported in #59235: Allow to ignore schema evolution in Iceberg table engine and read all data using schema specified by the user on table creation or latest schema parsed from metadata on table creation. This is done under a setting iceberg_engine_ignore_schema_evolution that is disabled by default. Note that enabling this setting can lead to incorrect result as in case of evolved schema all data files will be read using the same schema. #59133 (Kruglov Pavel).

Bug Fix (user-visible misbehavior in an official stable release)

• Delay reading from StorageKafka to allow multiple reads in materialized views #58477 (János Benjamin Antal).
• Fix a stupid case of intersecting parts #58482 (Alexander Tokmakov).
• Disable max_joined_block_rows in ConcurrentHashJoin #58595 (vdimir).
• Fix stream partitioning in parallel window functions #58739 (Dmitry Novik).
• Fix double destroy call on exception throw in addBatchLookupTable8 #58745 (Raúl Marín).
• Fix JSONExtract function for LowCardinality(Nullable) columns #58808 (vdimir).
• Multiple read file log storage in mv #58877 (János Benjamin Antal).
• Fix: LIMIT BY and LIMIT in distributed query #59153 (Igor Nikonov).
• Fix not-ready set for system.tables #59351 (Nikolai Kochetov).
• Fix translate() with FixedString input #59356 (Raúl Marín).

NOT FOR CHANGELOG / INSIGNIFICANT

• Follow-up to #58482 #58574 (Alexander Tokmakov).
• Fix possible race in ManyAggregatedData dtor. #58624 (Nikolai Kochetov).
• Change log level for super imporant message in Keeper #59010 (alesapin).
• Decrease log level for one log message #59168 (Kseniia Sumarokova).
• Fix fasttest by pinning pip dependencies #59256 (Azat Khuzhin).
• No debug symbols in Rust #59306 (Alexey Milovidov).