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Refactor TrxUndoRsegsIterator for further simplification
TrxUndoRsegs::append(): Remove. TrxUndoRsegsIterator::set_next(): Add a debug assertion that demonstrates that the merging of rollback segments never occurs. Since MDEV-12289 or earlier, MariaDB 10.2 will not make any temporary undo log accessible to the purge subsystem. (Also MySQL 5.7 would skip the purge of any undo log for temporary tables, but not before parsing and buffering those temporary undo log records.)
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