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mariadb/mysql-test/suite/versioning/t
Aleksey Midenkov e53e7cd134 MDEV-20545 Assertion col.vers_sys_end() in dict_index_t::vers_history_row
Index values for row_start/row_end was wrongly calculated for inplace
ALTER for some layout of virtual fields.

Possible impact

  1. history row is not detected upon build clustered index for
     inplace ALTER which may lead to duplicate key errors on
     auto-increment and FTS index add.
  2. foreign key constraint may falsely fail.
  3. after inplace ALTER before server restart trx-based system
     versioning can cause server crash or incorrect data written upon
     UPDATE.
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