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This is preparation for MDEV-12288, which would set DB_TRX_ID=0 when purging history. Also with that change in place, delete-marked records must always refer to an undo log record via a nonzero DB_TRX_ID column. (The DB_TRX_ID is only present in clustered index leaf page records.) btr_cur_parse_del_mark_set_clust_rec(), rec_get_trx_id(): Statically allocate the offsets (should never use the heap). Add some debug assertions. Replace some use of rec_get_trx_id() with row_get_rec_trx_id(). trx_undo_report_row_operation(): Add some sanity checks that are common for all operations that produce undo log. |
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