- 5.7 outputs additional columns from EXPLAIN since EXTENDED and PARTITIONS have
   been turned on by default.
   1) This causes the 'rows' column to shift from position 9 to 10
   2) Also it introduces the new column 'filtered' which is to be
      considered as unreliable as 'rows'. Quoting comment in existing
      test case "experience has shown that 'rows' estimates may vary
      depending on OS, compiler and .. phase of moon."
 - Fix problem by increasing the column number in masking of 'rows' and at the
   same time add masking of the 'filtered' column.
 - NOTE! Should have done this the first time when EXPLAIN output was recorded
   for 5.7 but the problem went unnoticed at that time.