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ClickHouse® is a real-time analytics database management system
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Click House v26.10.2.103-stable

Click House: v26.10.2.103-stable Release

Release date:
October 24, 2026
Previous version:
v26.10.1.1-new (released September 16, 2026)
Magnitude:
3,625 Diff Delta
Contributors:
45 total committers
Data confidence:
Commits:
927 impacting commits

38 Features Released with v26.10.2.103-stable

Add `PCO` compression codec (linking the pcodec Rust crate)
#110613
Web terminal: arbitrary PTY input crashes the whole server (replxx cursor/buffer desync)
#126008
Cross-compilation for Illumos (amd64)
#23777
Text index with splitByString tokenizer + postprocessor: hasPhrase returns wrong results on every execution path (silent row loss and false positives)
#117075
Silent data loss: TTLDrop merge empties parts with stale TTL info after ATTACH
#121124
Constant-false UNION ALL branch with a LEFT JOIN is no longer skipped, about 2.6x slower (26.6 -> 26.8)
#123702
system.blob_storage_log records Upload, Delete and the three multipart events — there is no event type for a copy.
#123163
merge_table_large_query +33% — planning over Merge tables became O(nodes × child tables) in 26.7
#113202
Parquet PREWHERE: decode dictionary-encoded pages with the filter in the decoder (ClickBench q31 -34%, q32 -24%)
#123483
`SELECT s, s.x` on column-mapped Delta fails: subcolumn name stays logical
#123811
golang pgx/v5(postgres dirver) ping does not work
#84085
`parallel_hash` join returns blocks larger than `max_joined_block_size_rows`
#124198
NATS direct SELECT segfaults: `read` re-reads `consumers_connection` after reset
#120199
A `SETTINGS` name that is not a setting at all is silently accepted and stored by `File`, `URL`, `S3` and the `Log` family
#120705
Custom Executable UDF - Unknown element 'functions' found in config UNKNOWN_ELEMENT_IN_CONFIG
#123308
AvroConfluent SIGSEGV reading Avro map into `Map(DateTime, String)`
#125457
CapnProto import scanner loses `import` across a comment; deep schema still SIGSEGVs
#116032
Argument-less function in a JSON-AST projection: SIGSEGV in window collector
#121100
Null dereference in ORCColumnToCHColumn::orcTableToCHChunk exception message
#123305
Two skip indexes + an OR with a constant disjunct + a function-wrapped comparison (`toString(e) < 'c' AND (0 OR id != 5)`) return no rows: the combined skip-index AND/OR processing prunes every granule (`use_skip_indexes_for_disjunctions`)
#119528
Avro read with explicit structure crashes on deeply chained named record types
#124925
`__topKFilter` (`use_top_k_dynamic_filtering`) throws TYPE_MISMATCH for `ORDER BY <Interval column> LIMIT n`
#125197
`plain_rewritable`: part removal copies every blob before deleting it
#123275
Parquet page with a short `compressed_page_size` makes the reader spin forever, ignoring `max_execution_time`
#123274
Unqualified dictGet inside SQL UDF used by ALIAS column succeeds on SELECT but fails on DELETE
#123489
set skip index on a Nullable column keeps granules that contain NULL, about 2x slower (26.6 -> 26.8)
#123705
Atomic MATERIALIZED VIEW POPULATE duplicates rows in DBReplicated: 04494_atomic_populate_materialized_view_parallel_replicas
#124446
GROUP BY on Nullable keys never uses the adaptive aggregator; admitting the methods that pack NULLs into the key makes it up to 1.7x faster with 2.5x less memory
#124668
Dangling tuple element type when the KV tuple key filter holds LowCardinality
#120527
DataLakeCatalog (REST): DROP TABLE sends purgeRequested=False (capital F) and never requests a purge
#125410

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Top Contributors in v26.10.2.103-stable

robot-clickhouse
alexey-milovidov
nihalzp
groeneai
rschu1ze
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Algunenano
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