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ClickHouse v20.10.4.1 Release Notes

Release Date: 2020-11-13 // over 3 years ago

  • 🐛 Bug Fix

    • 🛠 Fix rare silent crashes when query profiler is on and ClickHouse is installed on OS with glibc version that has (supposedly) broken asynchronous unwind tables for some functions. This fixes #15301. This fixes #13098. #16846 (alexey-milovidov).
    • Fix IN operator over several columns and tuples with enabled transform_null_in setting. Fixes #15310. #16722 (Anton Popov).
    • This will fix optimize_read_in_order/optimize_aggregation_in_order with max_threads>0 and expression in ORDER BY. #16637 (Azat Khuzhin).
    • 🚚 Now when parsing AVRO from input the LowCardinality is removed from type. Fixes #16188. #16521 (Mike).
    • Fix rapid growth of metadata when using MySQL Master -> MySQL Slave -> ClickHouse MaterializeMySQL Engine, and slave_parallel_worker enabled on MySQL Slave, by properly shrinking GTID sets. This fixes #15951. #16504 (TCeason).
    • 🛠 Fix DROP TABLE for Distributed (racy with INSERT). #16409 (Azat Khuzhin).
    • 🛠 Fix processing of very large entries in replication queue. Very large entries may appear in ALTER queries if table structure is extremely large (near 1 MB). This fixes #16307. #16332 (alexey-milovidov).
    • 🛠 Fix bug with MySQL database. When MySQL server used as database engine is down some queries raise Exception, because they try to get tables from disabled server, while it's unnecessary. For example, query SELECT ... FROM system.parts should work only with MergeTree tables and don't touch MySQL database at all. #16032 (Kruglov Pavel).

    👌 Improvement

    • ↪ Workaround for use S3 with nginx server as proxy. Nginx currenty does not accept urls with empty path like http://domain.com?delete, but vanilla aws-sdk-cpp produces this kind of urls. This commit uses patched aws-sdk-cpp version, which makes urls with "/" as path in this cases, like http://domain.com/?delete. #16813 (ianton-ru).