clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Require the SELECT privilege for a set table on the right of IN
- Do not substitute a join key that cannot be re-evaluated into a pushed-down filter
- LDAP: search-and-bind authentication with a service account
- Correct estimated compression ratio in a couple of cases
- Hold S3 header-name normalization in the type
- LDAP: `tls1.3`, `tls_maximum_protocol_version`, configurable timeouts, LDAPS integration test
- Publish a known total row count before the query starts reading
- hasAnyTokens/hasAllTokens tokenize every row on the fallback path; skipping rows that cannot match cuts latency 40-49%
- Extend outer to inner join conversion
- Perf(String): Speed up isAllASCII on AVX-512
- Docs
- C++ not yet supported