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Bug: FunctionVariantAdaptor silently returns 0 rows in WHERE when all Variant alternatives are incompatible

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.

#100251 In ClickHouse/ClickHouse;

· bacek opened on Mar 21, 2026

Remove mutable fields from Functions in favor of using FunctionBuilder, FunctionOverloadResolver

developmentDevelopement process & source code & implementation detailsDevelopement process & source code & implementation details

Status: Open.

#100238 In ClickHouse/ClickHouse;

· alexey-milovidov opened on Mar 20, 2026

Flaky test: 04002_cast_nullable_read_in_order

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.

#100221 In ClickHouse/ClickHouse;

· rienath opened on Mar 20, 2026

NATURAL JOIN with no common columns produces invalid 'NATURAL CROSS JOIN' in reconstructed AST

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

Status: Open.

#100220 In ClickHouse/ClickHouse;

· zlareb1 opened on Mar 20, 2026

cutURLParameter function doesn't always work for similar parameters

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

Status: Open.

#100219 In ClickHouse/ClickHouse;

· leftmain opened on Mar 20, 2026

Optimize cutURLParameter by eliminating unnecessary memory shifts

performance

Status: Open.

#100216 In ClickHouse/ClickHouse;

· leftmain opened on Mar 20, 2026

[CI crash] ColumnVariant creation during decompression failed

crash-ci

Status: Open.

#100211 In ClickHouse/ClickHouse;

· robot-ch-test-poll2 opened on Mar 20, 2026

Add Contributing section to README

Status: Open.

#100198 In ClickHouse/ClickHouse;

· JithunMethusahan opened on Mar 20, 2026

NOT_FOUND_COLUMN_IN_BLOCK exception raised when selecting from table with row policy

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

Status: Open.

#100194 In ClickHouse/ClickHouse;

· tadeboro opened on Mar 20, 2026

Analyzer: Query silently returns 0 rows due to incorrect filter pushdown with ARRAY JOIN (bypassed by 1=1 AND)

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.

#100191 In ClickHouse/ClickHouse;

· mohdmsl opened on Mar 20, 2026

Idea: diagnose tests failed due to randomized settings.

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

Status: Open.

#100178 In ClickHouse/ClickHouse;

· alexey-milovidov opened on Mar 20, 2026

Logical error: Invalid aggregation key type for HashMethodSingleLowCardinalityColumn method. Excepted LowCardinality, got A (STID: 5484-4ce5)

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.

#100175 In ClickHouse/ClickHouse;

· PedroTadim opened on Mar 20, 2026