clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Timezone-only MODIFY COLUMN bypasses the key-column ALTER guard: primary-key and partition pruning silently lose rows when the key is an expression over the column
- SYSTEM REFRESH VIEW during the RANDOMIZE FOR early window moves the schedule backwards and re-runs the completed timeslot, duplicating rows in an APPEND refreshable materialized view
- JSONColumns formats insert the type default instead of the DEFAULT expression for an explicit null under input_format_null_as_default
- additional_table_filters keyed on a Merge table is silently dropped for MergeTree children when the Merge also has a Distributed child
- Query compilation is quadratic in the number of OR-ed predicates: 140s for 128k `JSONHas` terms on a 1-row table (three O(N²) spots, fixes for two)
- Pending `ALTER UPDATE` applied on the fly does not reach a `DEFAULT` column that reads the updated column
- Add a `jsonStringValues` text index tokenizer for path-scoped JSON text search
- PR kill switch strips parallel replicas from subqueries of JOIN-free queries
- Preserve float keys when `DISTINCT` spills
- Move TTL input stays gathered: merge throws NOT_FOUND_COLUMN_IN_BLOCK
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