IMPALA-5262: test_analytic_order_by_random fails with assert
IMPALA-5262: test_analytic_order_by_random fails with assert

This was a poorly written test that relies on assumptions about
the behavior of 'rand' and the order that rows get processed in
a table that Impala doesn't actually guarantee.

The new version is still sensitive to the precise behavior of
'rand()', but shouldn't be flaky unless that behavior is changed.

Change-Id: If1ba8154c2b6a8d508916d85391b95885ef915a9
Reviewed-on: http://gerrit.cloudera.org:8080/6775
Reviewed-by: Alex Behm <fe1626037acfc2dc542d2aa723a6d14f2464a20c@cloudera.com>
Tested-by: Impala Public Jenkins

cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala,cloudera/Impala