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timeSeriesRange/timeSeriesFromGrid silently truncate Int64/UInt64 step to lower 32 bits for DateTime/UInt32 timestamps

Status: Open.

#104266 In ClickHouse/ClickHouse;

· clickgapai opened on May 6, 2026

FINAL with WHERE on PARTITION BY column reads all partitions when partition column not in primary key (regression in 26.3)

performance

Status: Open.

#104263 In ClickHouse/ClickHouse;

· fm4v opened on May 6, 2026

formatDateTime() %c and %l appear to be zero-padded, unlike MySQL-compatible expectations

potential bugTo be reviewed by developers and confirmed/rejected.To be reviewed by developers and confirmed/rejected.

Status: Open.

#104261 In ClickHouse/ClickHouse;

· mshinkarow opened on May 6, 2026

Block structure mismatch (AMBIGUOUS_COLUMN_NAME) when projection is picked and SELECT alias collides with source column name (regression from #88798)

potential bugTo be reviewed by developers and confirmed/rejected.To be reviewed by developers and confirmed/rejected.

Status: Open.

#104256 In ClickHouse/ClickHouse;

· fm4v opened on May 6, 2026

constructLocation Azure branch uses find("/" + bucket) which matches inside the URL host — drops container from URL when bucket name is a prefix of the storage-account hostname

Status: Open.

#104249 In ClickHouse/ClickHouse;

· clickgapai opened on May 6, 2026

LOGICAL_ERROR: Block structure mismatch between MergeSortingTransform and WindowTransform with projection + window + WHERE on non-key column when query_plan_remove_unused_columns=0 (regression in 26.4)

Status: Open.

#104235 In ClickHouse/ClickHouse;

· fm4v opened on May 6, 2026

Test 01710_projection_additional_filters is flaky

flaky testflaky test found by CIflaky test found by CI

Status: Open.

#104219 In ClickHouse/ClickHouse;

· nickitat opened on May 6, 2026

QueryConditionCache is poisoned by AST fuzzer queries — subsequent normal WHERE queries return zero rows

CIfor issues found in CIfor issues found in CI

Status: Open.

#104203 In ClickHouse/ClickHouse;

· qoega opened on May 6, 2026

LWU with parallel replicas SEGV

bugConfirmed user-visible misbehaviour in official releaseConfirmed user-visible misbehaviour in official release

comp-parallel-replicasParallel reading from replicas for query speed (not data replication consistency).Parallel reading from replicas for query speed (not data replication consistency).

crashCrash / segfault / abortCrash / segfault / abort

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

Status: Open.

#104197 In ClickHouse/ClickHouse;

· PedroTadim opened on May 6, 2026

optimize_read_in_order=1 coule be much slower than normal query。

performance

Status: Open.

#104186 In ClickHouse/ClickHouse;

· zdyj3170101136 opened on May 6, 2026

[CI crash] Segfault in AggregateFunctionCrossTab<CramersVData>::serializeBatch on TCP send path

crash-ci

Status: Open.

#104183 In ClickHouse/ClickHouse;

· alexey-milovidov opened on May 6, 2026

ASan leak in TemporaryTableHolder from EXPLAIN analyzer path (cross-test, cross-PR)

Status: Open.

#104176 In ClickHouse/ClickHouse;

· alexey-milovidov opened on May 6, 2026