clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- DROP NAMED COLLECTION succeeds while a detached table still depends on it
- Cache dictionary table read fabricates a DEFAULT row for a deleted source key
- parseQueryToJSON writes a large Float64 literal that formatQueryFromJSON cannot read back (integer overflow in Poco JSON parser)
- formatQueryFromJSON rejects parseQueryToJSON output for a partially named Tuple(...) type (empty element name)
- BACKUP/RESTORE ... TABLE db.t AS t loses the rename through parseQueryToJSON / formatQueryFromJSON (RESTORE target silently changes database)
- formatQueryFromJSON rejects parseQueryToJSON output for TTL expr GROUP BY without grouping keys
- JSON AST reader/writer round-trip fixes: Float64, Tuple, BACKUP/RESTORE, TTL, DESCRIBE, JSON type args
- Object storage globs read Hive staging and marker paths (_temporary/, .spark-staging-*/): phantom rows and "The specified key does not exist" failures racing writer commits
- aggregate_function_input_format='value' gives phantom state for omitted fields
- Segmentation fault in `StorageDistributed::read` when a scalar subquery over `remote`/`remoteSecure` is evaluated through `InterpreterSelectQuery` (e.g. in a table `CONSTRAINT` during `ATTACH TABLE`)
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- C++ not yet supported