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Enable optimize_if_transform_strings_to_enum by default

performance

Status: Open.

#107422 In ClickHouse/ClickHouse;

· alexey-milovidov opened on Jun 13, 2026

Incorrect result: RewriteAggregateFunctionWithIfPass miscompiles NULL-preserving aggregates (anyRespectNulls family)

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

Status: Open.

#107421 In ClickHouse/ClickHouse;

· alexey-milovidov opened on Jun 13, 2026

Build error on enabling NO_ARMV81_OR_HIGHER on Huawei Kunpeng 920 server

alternative build

build

close in a month if not activeThis will be closed in case of no informationThis will be closed in case of no information

minorPriority: minorPriority: minor

Status: Open.

#107399 In ClickHouse/ClickHouse;

· Tiaonmmn opened on Jun 13, 2026

Parquet reader on hive partitoned files fails with NOT_FOUND_COLUMN_IN_BLOCK if using WHERE on parquet columns

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

Status: Open.

#107380 In ClickHouse/ClickHouse;

· Ziming-W opened on Jun 13, 2026

Flaky test: test_replicated_database::test_sync_replica exceeds 900s pytest-timeout (slow, not a DROP DATABASE SYNC hang)

Status: Open.

#107378 In ClickHouse/ClickHouse;

· groeneai opened on Jun 13, 2026

ClickHouse Parquet reader incorrectly throws ICEBERG_SPECIFICATION_VIOLATION for v3 tables

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

Status: Open.

#107343 In ClickHouse/ClickHouse;

· snicholasbarton opened on Jun 12, 2026

CSVWithNames structure mismatch when unwrapping tuples

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.

#107342 In ClickHouse/ClickHouse;

· AndreyGudilin opened on Jun 12, 2026

DeltaLake Logical error: 'No version found in table state snapshot'

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.

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

Status: Open.

#107334 In ClickHouse/ClickHouse;

· PedroTadim opened on Jun 12, 2026

Iceberg Logical error: 'schemasAreIdentical(*iceberg_table_schemas_by_ids.at(schema_id), *schema_ptr, type_mapping)'

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.

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

Status: Open.

#107316 In ClickHouse/ClickHouse;

· PedroTadim opened on Jun 12, 2026

Wrong results: ORDER BY col DESC LIMIT 1 returns 0 rows — TopK granule skip-index (use_skip_indexes_for_top_k) ignores lightweight-delete mask and prunes the part with live top rows

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

Status: Open.

#107309 In ClickHouse/ClickHouse;

· fm4v opened on Jun 12, 2026

LOGICAL ERROR: Block structure mismatch in UnionStep stream - Sparse column serialization

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

Status: Open.

#107273 In ClickHouse/ClickHouse;

· npakeer opened on Jun 11, 2026

Local-primary cloud-backed disk for MergeTree using ephemeral SSD plus object-storage mirror

Status: Open.

#107269 In ClickHouse/ClickHouse;

· tanner-bruce opened on Jun 11, 2026