clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Docs: document concurrent ALTER TABLE mutation restrictions and MATERIALIZE INDEX combining limitations
- `FailedInternalQuery`/`FailedInternalInsertQuery`/`FailedInternalSelectQuery` not incremented in `logExceptionBeforeStart` — undercounts internal failures (parse errors, async insert flushes, MV refresh)
- Docs: clarify that MATERIALIZE COLUMN does not rebuild data skipping indexes
- Iceberg writer reports incorrect record_count / file_size_in_bytes in manifest
- kql_array_sort_asc wrong behavior
- Harden column-statistics loading against transient I/O failures
- Unexpected behaviour when run JSONExtractBool function with native JSON value
- Fuzzer: Logical error: Rows are not sorted with permutation, position A, previous_row index B, current_row index C
- Backport #104051 to 26.2: Refreshable MV: avoid duplicate refresh on brief keeper connection loss
- Backport #104133 to 26.2: Fix numerous semantic inconsistency with `optimize_inverse_dictionary_lookup`
- Docs
- C++ not yet supported