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github

ClickHouse/ClickHouse

Pick an open issue and Operate will investigate its root cause.

4,915 open issues

#113864 [CI crash] Logical error: "Part all_57_57_0_59 intersects previous part all_43_62_5_45" in `PartLoadingTree::add` during `ATTACH TABLE ... AS REPLICATED`
fuzz
crash-ci
comp-mergetree
#113859 Release SIGSEGV in ConstantJoin::addBlockToJoin (materializeColumnsFromRightBlock) on SEMI LEFT JOIN with runtime-constant ON over ARRAY JOIN + Nullable
fuzz
#113858 Distinguish `null` from absence of a value in the `JSON` type
feature
experimental feature
#113854 IN with a table-backed Set (ENGINE = Set) throws CANNOT_CONVERT_TYPE for out-of-range values where a literal IN list returns false
#113847 automatic IEJoin selection without setting join_algorithm = 'ie_join'
feature
comp-joins
#113846 Cannot MATERIALIZE key column CODEC change
close in a month if not active
#113845 IEJoin should choose its two key predicates by statistics selectivity, not ON order
feature
comp-joins
#113844 estimateCompressionRatio for type changes
feature
#113841 Logical error: 'std::exception. Code: 1001, type: std::out_of_range, e.what() = vector (version 26.8.1.1), Stack trace: (STID: 2508-3fb1)
testing
fuzz
comp-parquet-reader-v3
#113835 AST fuzzer (arm_asan_ubsan): server dies with SIGSEGV and no sanitizer report while a fuzzed query connects via `remoteSecure` to a loopback address
fuzz
potential bug
#113799 Logical error: 'database_name != "_temporary_and_external_tables"' (STID: 2508-48e6)
testing
fuzz
#113782 `SET format_avro_schema_registry_retry_initial_backoff_ms = 0` permanently bricks the session
bug
#113766 Correlated-subquery decorrelation with in-memory buffer disabled: `Cannot clone ReadFromLocalReplica plan step` under parallel replicas
bug
comp-parallel-replicas
correlated subqueries
#113765 make_distributed_plan: `Cannot clone ReadFromDummy plan step` for a view over a Distributed table with an IN (subquery) predicate
bug
comp-distributed
comp-query-analyzer
#113763 Propagating `getArgumentsThatCanBeOnlyNull` through the combinators silently changes the result type and value of every pre-existing `<agg>If<Combinator>(x, NULL)` expression
#113762 Flaky test `04640_query_log_map_columns_serialization`: `sum` over the prefetched read pool returns exactly 2^23 too much; `asynchronous_read_counters` sometimes empty in Fast test
flaky test
#113758 Segfault in `expandOrderByAll`: `ORDER BY ALL` + NATURAL JOIN over `merge()` with the old analyzer
fuzz
potential bug
#113751 Flaky 02346_text_index_parallel_replicas: TextIndexUsedEmbeddedPostings is counted at deserialization, not at use, so a warm tokens cache reads 0
#113745 Iceberg OPTIMIZE rejects position-delete overwrite snapshots when deleted row count != delete file count
#113741 Custom-key parallel replicas over a Merge table with a Distributed child: children are offloaded to a finalized stage (CANNOT_CONVERT_TYPE, logical error in GroupingAggregatedTransform)
comp-distributed
potential bug
comp-parallel-replicas
#113738 Add Support for snappy compression
feature
#113736 Keyed aggregations over huge constant-folded literals still pay a per-execution O(N) content-hash in the hash-table-stats cache key (bounded residual of #107643; ~9ms per execution for a 5M-element literal)
performance
#113734 JSON parsing: make `JSONExtractTree` object traversal allocation-free per key (reusable path buffer + two-bit duplicate-key masks) — JSONAsObject workloads parse 25–34% faster, peak memory down (pre-existing cost, not a regression)
performance
#113731 JSON object traversal pays duplicate-key bookkeeping on every key of every object — a no-duplicate fast path removes it (json_type_parsing q3 +33%, 26.6 → 26.7, aarch64)
performance
#113729 Logical error: Duplicate announcement received for replica number N (automatic parallel replicas + `query_plan_join_shard_by_pk_ranges`)
potential bug
comp-parallel-replicas
#113711 MATERIALIZED CTE is not materialized when queried through a VIEW
bug
experimental feature
#113708 Logical error 'Totals having transform was already added to pipeline' on WITH TOTALS EXCEPT DISTINCT WITH TOTALS over merge()
fuzz
#113706 Understanding the trade-offs of dirty_decay_ms=0 for jemalloc in ClickHouse
question
#113705 RFC: Lifetime-segregated memory placement (attribution == placement)
memory
#113704 NOT_FOUND_COLUMN_IN_BLOCK with `query_plan_optimize_lazy_final` when a FINAL query filters on an unprojected sorting-key column moved to PREWHERE
potential bug