Top ClickHouse issues

UNION ALL runs 2 times slower on version 20.3.12.112 compared with that on version 19.17.3.7

performance

Allow to undo ALTER TABLE ... MODIFY SETTING

feature

Can't start clickhouse 20.7.2.30 to centos7.5, last line in logs is "Will mlockall to prevent executable memory"

backward compatibility memory question question-answered unexpected behaviour v20.5-affected

Import from parquet IOError: Not yet implemented: Unsupported encoding.

bug comp-3rdparty-libs comp-formats

clickhouse-client failed with large volume data

invalid question st-need-info st-need-repro unexpected behaviour

How can I using Json-related-format to import multi-level nested Json data?

comp-formats question question-answered

Removing column comment from replicated materialized view isn't reflected in zookeeper.

bug comp-replication

Disable query complexity checks for distributed queries on root (initial) node

feature question

Parts using COMPACT format are slower than WIDE

performance st-fixed

Exception: Directory for table data already exists.

bug