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Marko Mäkelä authored
This should have been part of MDEV-12288. trx_undo_t::del_marks: Remove. Purge needs to process all undo log records in order to reset the DB_TRX_ID. Before MDEV-12288, it sufficed to only delete the purgeable delete-marked records, and it ignore other undo log. trx_rseg_t::needs_purge: Renamed from trx_rseg_t::last_del_marks. Indicates whether a rollback segment needs to be processed by purge. TRX_UNDO_NEEDS_PURGE: Renamed from TRX_UNDO_DEL_MARKS. Indicates whether a rollback segment needs to be processed by purge. This will be 1 until trx_purge_free_segment() has been invoked. row_purge_record_func(): Set the is_insert flag for TRX_UNDO_INSERT_REC, so that the DB_ROLL_PTR will match in row_purge_reset_trx_id(). trx_purge_fetch_next_rec(): Add a comment about row_purge_record_func() going to set the is_insert flag. trx_purge_read_undo_rec(): Always attempt to read the undo log record. trx_purge_get_next_rec(): Do not skip any undo log records. Even when no clustered index record is going to be removed, we may want to reset some DB_TRX_ID,DB_ROLL_PTR. trx_undo_rec_get_cmpl_info(), trx_undo_rec_get_extern_storage(): Remove. trx_purge_add_undo_to_history(): Set the TRX_UNDO_NEEDS_PURGE flag so that the resetting will work on undo logs that were originally created before MDEV-12288 (MariaDB 10.3.1). trx_undo_roll_ptr_is_insert(), trx_purge_free_segment(): Cleanup (should be no functional change).
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