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There's innodb_large_prefix as a possible workaround, which is default in 10.2 https://t.co/URwAEaZcN7
The reason is because MariaDB imposes a maximum of 767 bytes for indexes, and 767 / 4 = 191 (rounded down).
The danger of no Primary Key when replicating in RBR (partial protection with MariaDB 10.1) https://t.co/M6mABJdkmn by @jfg956