clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- S3Queue: a file's `/failed/<hash>.retriable` retry marker is orphaned in Keeper when the file eventually processes successfully
- Perf(Array): Optimize arrayIntersect for empty seed arrays
- Fix silently lost rows for a window function over a multi-shard query whose columns are only filtered or joined
- Lightweight \`UPDATE\`/\`DELETE\` passing an \`IN\` subquery with a \`MATERIALIZED\` CTE to \`ignore\` throws \`LOGICAL_ERROR\` "Reading from materialized CTE before its materialization completed"
- A TTLDelete merge refused by a full background pool is dropped while the partition's TTL timer stays armed, so expired rows outlive merge_with_ttl_timeout
- An aggregate state that serializes to zero bytes makes a `StripeLog` table unreadable and bricks `Set` and `Join` tables at the next restart, beyond `DROP`
- intDiv and intDivOrZero wrap an unsigned dividend to its same-width signed type when the other operand is signed, returning a negative quotient for positive operands
- A `VIEW` captures a `WITH` element into a subquery that opted out of `enable_global_with_statement`, returning different data than the same query run directly
- Support CREATE OR REPLACE TEMPORARY VIEW
- JSON path filter skips granules for a zero-padded FixedString constant
- Docs
- C++ not yet supported