Search results

Iceberg table function fails to execute queries when column names contain special characters (#)

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

Status: Open.

#94283 In ClickHouse/ClickHouse;

· ygrzjh opened on Jan 15, 2026

Running on a machine with a 64K page size, the spare stack memory allocated by ThreadStatus using stack_t is unreadable and writable, causing random crashes.

Status: Open.

#94282 In ClickHouse/ClickHouse;

· xiezhaokun opened on Jan 15, 2026

Catalogs not returning error properly

comp-datalakeIssues related to iceberg, delta lake and all the catalog integrations.Issues related to iceberg, delta lake and all the catalog integrations.

unfinished code

Status: Open.

#94276 In ClickHouse/ClickHouse;

· melvynator opened on Jan 14, 2026

Flaky test: 01174_select_insert_isolation

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.

#94219 In ClickHouse/ClickHouse;

· alesapin opened on Jan 14, 2026

Flaky test: 03759_join_filterpushdown_granules_read

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.

#94218 In ClickHouse/ClickHouse;

· alesapin opened on Jan 14, 2026

Implement zero-copy Block::slice() logic

performance

Status: Open.

#94213 In ClickHouse/ClickHouse;

· 4ertus2 opened on Jan 14, 2026

Can not read dot-separated column values in Iceberg tables starting from 25.11

comp-datalakeIssues related to iceberg, delta lake and all the catalog integrations.Issues related to iceberg, delta lake and all the catalog integrations.

comp-parquet-reader-v3Everything related to the Parquet reader v3.Everything related to the Parquet reader v3.

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

Status: Open.

#94196 In ClickHouse/ClickHouse;

· alsugiliazova opened on Jan 14, 2026

Old analyzer completely broken in 25.12

not plannedKnown issue, no plans to fix it currenltyKnown issue, no plans to fix it currenlty

old-analyzerRelevant when analyzer is disabledRelevant when analyzer is disabled

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.

#94181 In ClickHouse/ClickHouse;

· spinojara opened on Jan 14, 2026

DB::ColumnSparse::popBack(size_t): Assertion `n < _size' failed

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

Status: Open.

#94179 In ClickHouse/ClickHouse;

· PedroTadim opened on Jan 14, 2026

Iceberg History is broken for some Iceberg table

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

comp-datalakeIssues related to iceberg, delta lake and all the catalog integrations.Issues related to iceberg, delta lake and all the catalog integrations.

Status: Open.

#94176 In ClickHouse/ClickHouse;

· melvynator opened on Jan 14, 2026

query_masking_rules do not apply to system.functions — sensitive data in UDF definitions remains visible

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

Status: Open.

#94145 In ClickHouse/ClickHouse;

· fasolwbanke opened on Jan 14, 2026

Logical error: 'assertHasValidVersionMetadata()' (STID: 2508-48ff)

experimental featureBug in the feature that should not be used in productionBug in the feature that should not be used in production

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.

#94142 In ClickHouse/ClickHouse;

· rschu1ze opened on Jan 14, 2026