Documntation says an extent is 8 million rows. Extent is 8388608 rows

See https://mariadb.com/kb/en/library/columnstore-storage-architecture/. It says that an extent is 8M rows and consumes 8MB of storage for a 1 byte value. In the graphics, it uses the words 8 million rows.

An Extent is actually 8 Megarows = 8388608

This can be confusing to a user that might panic when the row count goes over 8000000 rows in an extent.