All issues

Search results

Normalize a table SETTINGS list that states one setting more than once

comp-mergetreeMergeTree* family: parts, merges, primary index, column statistics, background data transformation.MergeTree* family: parts, merges, primary index, column statistics, background data transformation.

comp-settingsSettings & configuration infrastructure (server/user/query settings, profiles).Settings & configuration infrastructure (server/user/query settings, profiles).

Status: Open.

#117047 In ClickHouse/ClickHouse;

· Algunenano opened on Aug 29, 2026

A full-definition ATTACH bypasses the UNIQUE KEY gates that CREATE enforces

comp-mergetreeMergeTree* family: parts, merges, primary index, column statistics, background data transformation.MergeTree* family: parts, merges, primary index, column statistics, background data transformation.

Status: Open.

#117045 In ClickHouse/ClickHouse;

· Algunenano opened on Aug 29, 2026

Faster JSON key output: avoid a per-row string copy and strlen in JSONUtils::writeTitle

performance

Status: Open.

#117043 In ClickHouse/ClickHouse;

· snelheidai opened on Aug 29, 2026

GROUP BY over Dynamic keys re-encodes the variant type and rebuilds a write buffer on every row

Status: Open.

#117042 In ClickHouse/ClickHouse;

· snelheidai opened on Aug 29, 2026

KeyCondition::checkInHyperrectangle applies the same monotonic chain once per condition atom, recomputing an identical transformed Range on every granule

Status: Open.

#117041 In ClickHouse/ClickHouse;

· snelheidai opened on Aug 29, 2026

Pending CLEAR COLUMN is applied eagerly at read time, but dependent MATERIALIZED columns are not recomputed

Status: Open.

#117035 In ClickHouse/ClickHouse;

· alexey-milovidov opened on Aug 29, 2026

Lightweight UPDATE of a base column returns a stale DEFAULT-column value when both columns are absent from the part (disagrees with heavy ALTER UPDATE)

Status: Open.

#117023 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

CHECK constraint containing arrayJoin is accepted but causes an out-of-bounds read and wrong-row diagnostics on INSERT (sibling of #117014)

Status: Open.

#117022 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

text / ngrambf_v1 index over-prunes for a FixedString constant on String columns (silent wrong result; #112206 fix did not cover the text-index path)

Status: Open.

#117021 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

Plan-time join conversions (LEFT to INNER, ANY to SEMI/ANTI) flip a coin when the filter hides rand inside a lambda — non-determinism in FunctionCapture bypasses the guard, rows silently dropped

Status: Open.

#117016 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

TTL arrayJoin(arr) is accepted at defaults and silently deletes rows with future TTLs (row-count contract violation, out-of-bounds reads with empty arrays)

Status: Open.

#117014 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

__topKFilter dispatch misses Nullable inside Tuple: Nullable(UInt8) prewhere

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

comp-query-optimizerQuery plan optimization: physical plan steps, plan-level rewrites and optimizations (QueryPlan pa...Query plan optimization: physical plan steps, plan-level rewrites and optimizations (QueryPlan pa...

comp-regular-functionRegular scalar functions: string processing, data conversion, arithmetic, math, comparison, condi...Regular scalar functions: string processing, data conversion, arithmetic, math, comparison, condi...

Status: Open.

#117013 In ClickHouse/ClickHouse;

· clickgapai opened on Aug 29, 2026