clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- JSONExtract*/JSONHas drop a leading empty key for native JSON arguments
- JSONExtractString/JSONExtract leak %2E for dotted keys in native JSON objects
- JSONExtract into JSON type ignores json_type_escape_dots_in_keys
- Prometheus query API rejects role, query_id, stacktrace, quota_key params
- Add `FixedArray` data type, subscripts `arr[i, j]` and `arr[][j]`, and `einsum`
- TinyLog/StripeLog/Log unreadable after rollback to 26.8 once 26.9+ appended to them (mixed LZ4/ZSTD blocks, CANNOT_DECOMPRESS)
- OPTIMIZE on an Iceberg table: LOGICAL_ERROR 'Background compaction is not initialized' on the server, segfault in clickhouse-local
- After a rollback, one table the old version cannot load breaks system.tables/parts/replicas on that server (ASYNC_LOAD_WAIT_FAILED)
- system.all_query_log fails with TYPE_MISMATCH when a rotated query_log_N from an older version has a shorter tuple column (transaction_id)
- Spread coordinated refreshable materialized view refreshes across replicas
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- C++ not yet supported