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Missing decompress call in tryGetSubcolumnFromBlock causes crash with compressed Memory tables

Status: Open.

#104901 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

When a Refreshable MaterializedView fails to delete tmp tables, it keeps creating more tmp tables until the server runs out of disk

unexpected behaviourResult is unexpected, but not entirely wrong at the same time.Result is unexpected, but not entirely wrong at the same time.

Status: Open.

#104900 In ClickHouse/ClickHouse;

· jtirjan opened on May 13, 2026

Per-part progress summing in readInOrder causes false TOO_MANY_ROWS for multi-part tables

Status: Open.

#104898 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

join_any_take_last_row not propagated to ConcurrentHashJoin and AUTO fallback HashJoin

Status: Open.

#104897 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

mysqlAmericanDate uses unconditional +2000 for year instead of proper 2-digit year conversion

Status: Open.

#104895 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

checkDropOrRenameCommandDoesntAffectInProgressMutations doesn't detect conflict between DROP STATISTICS and MATERIALIZE STATISTICS ALL

Status: Open.

#104894 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

countmin statistics give wrong estimates for Float32 columns due to hash mismatch between column and Field storage

Status: Open.

#104892 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

supportsDelete in DataLakeConfiguration throws LOGICAL_ERROR on freshly-attached data lake table with uninitialized metadata

Status: Open.

#104891 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

Vectorise MD5 with multi-buffer SIMD implementation

performance

Status: Open.

#104887 In ClickHouse/ClickHouse;

· khvn26 opened on May 13, 2026

SYSTEM SYNC MERGES hangs forever when scheduled parts don't exist or are dropped

Status: Open.

#104883 In ClickHouse/ClickHouse;

· clickgapai opened on May 13, 2026

FunctionsStress.stress

fuzzProblem found by one of the fuzzersProblem found by one of the fuzzers

testingSpecial issue with list of bugs found by CISpecial issue with list of bugs found by CI

Status: Open.

#104877 In ClickHouse/ClickHouse;

· nikitamikhaylov opened on May 13, 2026

Flaky test: 01721_join_implicit_cast_long_oldanalyzer

flaky testflaky test found by CIflaky test found by CI

testingSpecial issue with list of bugs found by CISpecial issue with list of bugs found by CI

Status: Open.

#104874 In ClickHouse/ClickHouse;

· Algunenano opened on May 13, 2026