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- #93288 · alexey-milovidov opened
on Dec 31, 2025 31 - #38986 · alexey-milovidov opened
on Jul 7, 2022 4 - #87836 · alexey-milovidov opened
on Sep 29, 2025 80
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Failed lazy ALTER MODIFY COLUMN to JSON with an incompatible typed path leaves the table with permanently failing merges; KILL MUTATION does not help
comp-mutationsALTER UPDATE/DELETE and mutation execution over parts (including lightweight updates/deletes).ALTER UPDATE/DELETE and mutation execution over parts (including lightweight updates/deletes).Status: Open.#120263 In ClickHouse/ClickHouse;Formatter unquotes
any: a quotedany(subquery)call re-parses asINcomp-sql-syntaxSQL/grammar parsing, AST nodes, syntax-level features.SQL/grammar parsing, AST nodes, syntax-level features.Status: Open.#120256 In ClickHouse/ClickHouse;TinyLog incomplete read.
comp-simple-enginesLightweight single-node table engines: Log/StripeLog (append-only logs), Buffer (async batching),...Lightweight single-node table engines: Log/StripeLog (append-only logs), Buffer (async batching),...easy taskGood for first contributorsGood for first contributorspotential bugTo be reviewed by developers and confirmed/rejected.To be reviewed by developers and confirmed/rejected.Status: Open.#120255 In ClickHouse/ClickHouse;GROUPING()over aDistributedtable throws 47Unknown expression or function identifier __grouping_setwhen the grouping-set mask constant exceedsoptimize_const_name_size(30 keys at the default)comp-distributedDistributed table engine & query routing across shards (sharding/load balancing).Distributed table engine & query routing across shards (sharding/load balancing).comp-query-analyzerSemantic analysis + logical/physical planning + rewrites (Analyzer and Planner modules).Semantic analysis + logical/physical planning + rewrites (Analyzer and Planner modules).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.#120250 In ClickHouse/ClickHouse;Rebuilt columns.txt takes types from live metadata; guard checks names only
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.#120249 In ClickHouse/ClickHouse;DeltaLake CREATE accepts
Nullable(Tuple), then every NULL INSERT into it failscomp-datalakeData lake table formats (Iceberg/Delta/Hudi) integration.Data lake table formats (Iceberg/Delta/Hudi) integration.Status: Open.#120247 In ClickHouse/ClickHouse;DeltaLake CREATE with non-Parquet
formatcommits unreadable data filescomp-datalakeData lake table formats (Iceberg/Delta/Hudi) integration.Data lake table formats (Iceberg/Delta/Hudi) integration.Status: Open.#120246 In ClickHouse/ClickHouse;A view referenced more than once in one query is read once per reference: sharing one read is 48% faster on TPC-H query 15
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.#120243 In ClickHouse/ClickHouse;hasAnyTokens/hasAllTokens tokenize every row on the fallback path; skipping rows that cannot match cuts latency 40-49%
comp-text-indexFull-text search: inverted/text index in MergeTree (tokenizers, posting lists, GIN-style index bu...Full-text search: inverted/text index in MergeTree (tokenizers, posting lists, GIN-style index bu...Status: Open.#120223 In ClickHouse/ClickHouse;keeper-bench SIGABRTs on any request error:
std::abortswallows the stop pathcomp-keeperClickHouse Keeper (Raft-based coordination layer; ZooKeeper replacement) and ZooKeeper client lib...ClickHouse Keeper (Raft-based coordination layer; ZooKeeper replacement) and ZooKeeper client lib...Status: Open.#120218 In ClickHouse/ClickHouse;SYSTEM WAIT VIEW returns Ok. while a requested refresh is still pending on another replica
comp-refreshable-materialized-viewRefreshable materialized views: scheduled/periodic refresh, refresh state machine, refresh orches...Refreshable materialized views: scheduled/periodic refresh, refresh state machine, refresh orches...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.#120205 In ClickHouse/ClickHouse;RIGHT JOIN+WHERE assumeNotNull(...)loses all rows in bothWHERE pandWHERE NOT p— query-plan optimizer honors a residual null-map afterassumeNotNullstrips it from the typecomp-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...fuzzProblem found by one of the fuzzersProblem found by one of the fuzzerssqlancerIssue found by SQLancer toolIssue found by SQLancer toolStatus: Open.#120204 In ClickHouse/ClickHouse;