clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add introspection TCP port
- `use_top_k_dynamic_filtering` installs a redundant/counterproductive `__topKFilter` prewhere when the read is already in-order via a sorting projection
- Validate engine features before rewriting metadata on ATTACH AS REPLICATED
- Support the Set table engine for materialized CTEs
- JSON type: wildcard/regex path type hints to prevent file descriptor explosion for high-cardinality dynamic keys
- Add keyValuePairs text-index tokenizer for Map columns
- Fix logical error on DISTINCT-in-order over ARRAY JOIN with stale sort property
- Serialize an empty polygon with zero rings (canonical WKB)
- Fix text index LOGICAL_ERROR with constant folding and partition key
- Fix Block structure mismatch after liftUpUnion with divergent aggregate state types
- Docs
- C++ not yet supported