clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- An unqualified IN <table> in a TTL DELETE WHERE is accepted at CREATE and stored unqualified, then every TTL merge fails with UNKNOWN_DATABASE and retries forever
- BACKUP of a Buffer table silently loses the buffered acknowledged rows that a graceful restart preserves
- A value inserted into a Variant column is silently stored in the wrong alternative and reinterpreted; literal IN sets over Variant mis-store members the same way, so IN/NOT IN disagree with =
- Re-adding a projection under a dropped projection's name silently returns wrong results while the DROP PROJECTION mutation is pending
- Exponential parse time for nested parens starting with column named `from`
- Subquery ARRAY JOIN pruning ignores tupleElement's default_value argument
- formatDateTime with LowCardinality arg drops Nullable: NULL formats as epoch
- kqlRangeCount rescale guard uses common::mulOverflow, a no-op for Int256
- `match('abc', 'abd\Q\E*c')` = 0: required substring keeps the optional `d`
- `^ab(?)*c` prunes matching rows: empty flag group `(?)` not zero-width
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