clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Deduplication within single writer scope
- Keeping dictionaries with lifetime=0 always in LOADED status
- Evaluate skip indexes for constant arrays
- Merges and fetches are stalled, even though the server has plenty of resources available
- Implement dynamic dispatch for StringSearcher
- Occurs error when (I)LIKE doesn't support search with-non-constant needles in constant haystack when left side is constant
- MATERIALIZE PROJECTION sometimes may require a lot of ram
- Problems with MaterializedPostgreSQL to Neon (LakeBase)
- Clarity Around CoalescingMergeTree And Nullable Columns
- A number of merge events is inflated
- Docs
- C++ not yet supported