- 5.7 outputs additional columns from EXPLAIN since EXTENDED and P
   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.