clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reduce high memory usage in advanced shared data serialization with huge number of unque and sparse paths, especially for JSON inside Arrays
- system.query_log normalized_query_hash differs for queries that only differ in sign of numeric literals (e.g. SELECT 1 vs SELECT -1)
- Remove ACCESS_DENIED and INVALID_ACCESS_KEY_ID from unretryable S3 errors
- system.query_log tables, databases, etc... columns not set on query cache hit
- Add bytes-aware read stream limit for MergeTree scans
- system.query_log tables, databases not set on trivial `count()` optimization
- RFC: Sortedness-aware join algorithm 'full_sorting_merge_if_sorted': use 'full_sorting_merge' automatically when both inputs are already ordered on the join key
- Concurrent ALTER ... UPDATE on a JSON column produces truncated subcolumn files that replicate to all replicas (CANNOT_READ_ALL_DATA), blocking table startup
- [RFC] Reclaimable memory and dynamic spilling on top of memory reservations
- CREATE VIEW privilege alone allows to create incremental materialized views
- Docs
- C++ not yet supported