The problem is that background statistics can race with statistics update
during INSERT and cause slightly inaccurate `Rows` count in table statistics
(this is deliberate to avoid excessive locking overhead). This was seen as
occasional .result difference in the test.

Mask out the unstable `Rows` column from SHOW TABLE STATUS; the value is not
related to what is being tested in this part of the test case.

Run ANALYZE TABLE before SHOW EXPLAIN to get stable row count in output.
Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>