clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Constant-folded tuple GROUP BY key throws THERE_IS_NO_COLUMN over shards
- `CREATE TABLE ... ON CLUSTER ... AS <table>` fails with `UNKNOWN_DATABASE` on a node without the source table
- Move SYSTEM query commands from InterpreterSystemQuery into SystemCommandFactory
- Count statement, dictionary, window function and system log docs in the feature_docs hook
- Iceberg: TRUNCATE TABLE on Iceberg tables
- max_bytes_before_external_join converts the hash join to grace hash join at half the configured value
- Switching a ConcurrentHashJoin to GraceHashJoin mid-build serializes the slot conversion on one mutex: 15-20x slower while spilling only 1.2 GiB
- IN (subquery) with a huge set: primary key analysis sorts the whole set single-threaded, once per KeyCondition, doubling memory and dominating the query (28 s vs 1 s for the JOIN)
- `transform` and `CASE x WHEN` hash every row with SipHash when the expression is `Nullable`
- WIP DO NOT REVIEW add bazel build configuration
- Docs
- C++ not yet supported