Do not let range estimator to return over 1 / 2 of total rows in table; use longlong in range estimation
btr0cur.h, ha_innobase.cc:
  Use longlong in range estimation, in case there are > 4 billion rows


sql/ha_innobase.cc:
  Use longlong in range estimation, in case there are > 4 billion rows
innobase/include/btr0cur.h:
  Use longlong in range estimation, in case there are > 4 billion rows
innobase/btr/btr0cur.c:
  Do not let range estimator to return over 1 / 2 of total rows in table; use longlong in range estimation