Comment 8 for bug 284123

General solution:

BIG_TABLES needs to go away, along with its autoconf m4 rules.

ha_rows should simply be typedef to system's off_t type.

New flag for my_getopt, GET_HAROWS maybe, as its size may vary on different architectures.

Check that cmd line opts which are ha_rows type are correctly using new flag instead of GET_ULONG.

(There was a similar issue years ago which lead to the creation of SHOW_HA_ROWS for system variables)