Fix for the bug#31048 for 64bit platforms.
subselect.test, subselect.result:
  Corrected text case for the bug#31048.


mysql-test/t/subselect.test:
  Corrected text case for the bug#31048.
mysql-test/r/subselect.result:
  Corrected text case for the bug#31048.
sql/opt_range.cc:
  Fix for the bug#31048 for 64bit platforms.