clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Replace PREWHERE in timeSeriesSelector
- Simplify initializing prometheus services in tests
- `isNumber(removeNullable(type))` in `PrettyBlockOutputFormat` does not strip `LowCardinality`, so `LowCardinality(numeric)` columns skip digit-group highlighting while plain or `Nullable` numeric columns are highlighted
- `trivial_limit = 1 + max_rows` triggers `TOO_MANY_ROWS` for boundary case `LIMIT N` with `max_rows_to_read = N`
- `getClientHTTPHeader` leaks HTTP Basic Auth credentials because filter checks `"authentication"` instead of `"authorization"`
- Add shared scan optimization for self-joins
- AST fuzzer: `Logical error: Incorrect ASTSelectWithUnionQuery (modes: 1, selects: 3)` (STID: 4337-3161)
- Cherry pick #103843 to 26.4: Preserve known identifiers in `obfuscateQuery`
- Add test: `Merge` engine over `MergeTree` with lightweight DELETE -- trivial count gating untested
- Add test: `--pager` override of `output_format_pretty_max_value_width` is untested
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- C++ not yet supported