v.21.11Improvements

Restore Multi-Threaded Data Reading for Log Engine

Official CH changelog text
Restore the possibility to read data of a table using the Log engine in multiple threads. #28125 (Vitaly Baranov).
Restored the ability to read data from tables using the Log engine with multiple threads.

Why it matters

Previously, reading from Log engine tables was limited to single-threaded access, which could constrain performance. This feature enables multi-threaded reading, improving parallelism and query efficiency when accessing Log engine tables.

How to use it

Users can benefit from multi-threaded reads on Log engine tables simply by executing queries normally, as the engine now supports parallel reading internally without requiring any additional configuration.

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