ClickHouse/docs/changelogs/v21.8.12.29-lts.md

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1	2022

2022 Changelog

ClickHouse release v21.8.12.29-lts FIXME as compared to v21.8.11.4-lts

Performance Improvement

• Backported in #31732: Improve performance of JSON and XML output formats. #31673 (Alexey Milovidov).

Bug Fix

• Backported in #31575: Quota limit was not reached, but the limit was exceeded. This PR fixes #31174. #31337 (sunny).

Bug Fix (user-visible misbehaviour in official stable release)

• Backported in #31204: Fix abort in debug server and DB::Exception: std::out_of_range: basic_string error in release server in case of bad hdfs url by adding additional check of hdfs url structure. #31042 (Kruglov Pavel).
• Backported in #31253: Fix bug in Keeper which can lead to inability to start when some coordination logs was lost and we have more fresh snapshot than our latest log. #31150 (alesapin).
• Backported in #31521: Remove not like function into RPNElement. #31169 (sundyli).
• Backported in #31552: Resolve nullptr in STS credentials provider for S3. #31409 (Vladimir Chebotarev).
• Backported in #31582: * Disable partial_merge_join_left_table_buffer_bytes before bug in this optimization is fixed. See #31009). * Remove redundant option partial_merge_join_optimizations. #31528 (Vladimir C).
• Backported in #31599: Fix invalid generated JSON when only column names contain invalid UTF-8 sequences. #31534 (Kevin Michel).
• Backported in #31779: RENAME TABLE query worked incorrectly on attempt to rename an DDL dictionary in Ordinary database, it's fixed. #31638 (Alexander Tokmakov).
• Backported in #31790: Settings input_format_allow_errors_num and input_format_allow_errors_ratio did not work for parsing of domain types, such as IPv4, it's fixed. Fixes #31686. #31697 (Alexander Tokmakov).
• Backported in #31829: Fixed there are no such cluster here error on execution of ON CLUSTER query if specified cluster name is name of Replicated database. #31723 (Alexander Tokmakov).
• Backported in #31813: Fix race in JSONEachRowWithProgress output format when data and lines with progress are mixed in output. #31736 (Kruglov Pavel).
• Backported in #31761: Fix usage of Buffer table engine with type Map. Fixes #30546. #31742 (Anton Popov).
• Backported in #31890: Fix possible assertion ../src/IO/ReadBuffer.h:58: bool DB::ReadBuffer::next(): Assertion '!hasPendingData()' failed. in TSKV format. #31804 (Kruglov Pavel).
• Backported in #31910: Fix functions empty and notEmpty with arguments of UUID type. Fixes #31819. #31883 (Anton Popov).

NOT FOR CHANGELOG / INSIGNIFICANT

• Support toUInt8/toInt8 for if constant condition optimization. #31866 (Nikolai Kochetov).