clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Sparsity-aware part/granule pruning and trivial-count optimization
- Fix Iceberg Avro NULL partition values written as 0 (#105852)
- Make cascading materialized views see the row being inserted
- Fix MutateTask nullptr deref on column dropped by concurrent ALTER
- Fix EXISTS semantics with correlated columns in the inner SELECT list
- Reject Iceberg ALTER DELETE/UPDATE on non-Parquet tables
- Log live local thread pools at GlobalThreadPool shutdown
- Cherry pick #103268 to 25.8: Fix data loss on HDFS writes: flush buffer in WriteBufferFromHDFS::finalizeImpl
- Refreshable MV target tables keep stale inactive parts between refreshes and repeatedly abort background merges
- Logic error: predicate partitioning violation with correlated EXISTS and RIGHT JOIN returns zero for all TRUE/FALSE/NULL branches in ClickHouse
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- C++ not yet supported