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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

Iceberg v3: filtering on _last_updated_sequence_number or _row_id silently loses rows whose physical lineage values are NULL (inherited)

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

Status: Open.

#117007 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

Legacy-toTime column re-derivation re-flattens Nested, breaking CREATE ... AS

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

comp-ddlDDL command coordination and execution (ON CLUSTER, DDL queue).DDL command coordination and execution (ON CLUSTER, DDL queue).

comp-materialized-viewMaterialized views: insert-triggered MV pipeline, insert dependencies, deduplication.Materialized views: insert-triggered MV pipeline, insert dependencies, deduplication.

Status: Open.

#117001 In ClickHouse/ClickHouse;

· clickgapai opened on Aug 29, 2026

OPTIMIZE MANIFEST refused when snapshot summary omits total-records

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

comp-datalakeData lake table formats (Iceberg/Delta/Hudi) integration.Data lake table formats (Iceberg/Delta/Hudi) integration.

Status: Open.

#117000 In ClickHouse/ClickHouse;

· clickgapai opened on Aug 29, 2026

Iceberg: reading a table with a Decimal(38, 38) column silently loses rows — rounded-bound compensation overflows Int128 and min-max-prunes the data file

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

Status: Open.

#116999 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026

Incorrect results: Light weight updates can give wrong results when block number turned off and on.

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

Status: Open.

#116997 In ClickHouse/ClickHouse;

· npakeer opened on Aug 29, 2026

Primary key on mortonEncode/hilbertEncode silently loses rows for values >= 2^32: space-filling-curve index analysis assumes the encode is lossless

bug-unreleasedBug that affects unreleased or experimental codeBug that affects unreleased or experimental code

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

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...

Status: Open.

#116989 In ClickHouse/ClickHouse;

· zlareb1 opened on Aug 29, 2026