clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- force_data_skipping_indices and force_primary_key throw INDEX_NOT_USED when the query reads a second table that cannot use the index
- Plan-based parallel replicas: a read using direct read from a text index cannot be distributed (index read tasks are not serialized)
- fix(S3Queue): do not misattribute retried registry as fresh create
- Float-only codecs are accepted by the codec-valued MergeTree settings and fail at write time instead of at CREATE
- MOVE PARTITION TO TABLE still replicated: wedges Replicated db DDL queue
- bloom_filter skip index over-prunes for a FixedString constant on the subquery-IN and mapValues arrayElement paths (silent wrong result; #112206 fix incomplete)
- SELECT throws ILLEGAL_COLUMN (stale toUInt32 alter-conversion) after DROP + re-ADD of a column with a different type, until the drop's cleanup mutation rewrites the part
- index_granularity near 2^64: ceil-division overflow makes the part read as empty
- force_restore_data recovery silently resurrects TRUNCATEd data on a ReplicatedMergeTree replica when power loss drops the empty covering part but keeps the covered parts
- Append to a 1..64-byte file on an `encrypted` disk stacks a second encryption header: torn-write recovery bricks Log/StripeLog tables with a misleading UNKNOWN_CODEC, and the INSERT reports success
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