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copy of https://github.com/mariadb-corporation/mariadb-columnstore-engine/pull/3021 Propagate the TL lock to TL_READ_NO_INSERT, blocking any concurrent writes until the end of a copy stage. After that, this lock will be unlocked, allowing a window to write into a table before MDL is upgraded to exclusive (see online_alter_read_from_binlog call and the "alter_table_online_before_lock" debug syncpoint). This window will be covered by the second replication iteration after the lock upgrade