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Two bugs in MRR in need of review/comment



I filed these two bugs against multi-range read (MRR) in MariaDB 10.0.12
which affected us and could use some review of the patch for correctness,
along with development of a proper test case:

MDEV-6878 <https://mariadb.atlassian.net/browse/MDEV-6878>: Use of
uninitialized saved_primary_key in Mrr_ordered_index_reader::resume_read()
MDEV-6879 <https://mariadb.atlassian.net/browse/MDEV-6879>: Dereference of
NULL primary_file->table in DsMrr_impl::get_disk_sweep_mrr_cost()

Could someone please take a look at them?