clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Parquet spatial-pruning schema walk loops on unvalidated num_children
- `grouping()` over a two-shard `Distributed` table throws 10 `NOT_FOUND_COLUMN_IN_BLOCK` with `optimize_skip_unused_shards = 1`: `__groupingOrdinary(..., _CAST([0], 'Array(UInt64)'), 1)` vs `[0]` header mismatch (regression since 26.9)
- `additional_table_filters` / `additional_result_filter` with a column matcher (`*`, `COLUMNS('.*')`, `t.*`) throws 1 `Unqualified matcher * cannot be resolved. There are no table sources`; the same predicate works in `WHERE` and under the old analyzer
- Remote/RemoteSecure still runs the host allowlist check during metadata replay
- DatabaseHDFS::getEngineName returns "S3": system.databases misreports the engine
- Type hint enables Enum->name rewrite on the no-cast `has` const-array path
- Wrapped element type defeats the new hint: `Nullable(Date)` still re-based as seconds
- Add `EXPLAIN TEXT` for query formatting and pagination rewrites
- flushBuffer returns true for an empty buffer: shutdown drain never breaks early
- The nondeterministic-mutation guard for `Replicated` tables ignores virtual columns flagged `deterministic=false`
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