results.

st_select_lex_unit::print() was losing UNION ALL if in statement were present
UNION DISTINCT.


mysql-test/r/view.result:
  Test case for bug #10624  Views with multiple UNION and UNION ALL produce incorrect results.
mysql-test/t/view.test:
  Test case for bug #10624  Views with multiple UNION and UNION ALL produce incorrect results.
sql/sql_lex.cc:
  Fix bug #10624 Views with multiple UNION and UNION ALL produce incorrect results.