clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- A buffered common subplan (`ReadFromCommonBuffer`) can be read before its writers finish: `Trying to extract chunk from ChunkBuffer before all inputs are finished`
- v3 UPDATE mints a fresh first_row_id block: rewritten row loses its `_row_id`
- Exclusive S3Queue burns one retry too many: `loading_retries=1` retries zero times
- Exclusive S3Queue: {replica} resolves differently on restart, ingestion stops
- `ALTER RENAME COLUMN` racing with a merge still loses data on `26.3`: `04238_alter_rename_column_merge_race` fails ~12% there and 0% everywhere else
- EXPLAIN AST optimize=1 dumps view-body secrets; SHOW CREATE masks them
- SETTINGS clause does gate `session_query_ids` recording in clickhouse-client
- Part audit uses AllPhysical: an ALIAS-converted column makes the part unreadable
- Killed DROP COLUMN mutation: part refused, reads and merges fail forever
- Trino dialect: `INSERT ... VALUES` applies ClickHouse backslash escapes, `SELECT` does not
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