clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `titlecase_mapping` uses simple `u_totitle` instead of full titlecase mapping, making it identical to `simple_titlecase_mapping`
- Add integration tests for AI text functions
- `convertTupleToArray` CASTs tuple elements to LHS type, causing silent integer overflow and wrong `IN` results
- `executePartitionByExpression` missing subcolumn materialization causes exception on `INSERT` when partition key applies function to subcolumn
- `readSchema` case-insensitive lookup mismatch drops JSON logical type for mixed-case column names
- `input_format_max_block_size_bytes` silently ignored for INSERT operations due to `value_or` receiving `std::optional(0)` instead of `std::nullopt`
- Wrong output format in `maxMappedArrays` documentation example
- `count_distinct_optimization` overcounts by including NULL group when column is `Nullable`
- Fix AND single-argument collapse in LogicalExpressionOptimizerPass
- GROUP BY const(0./-0.) differ from materialized columns
- Docs
- C++ not yet supported