RONDB-753 TTL FEATURE [PATCH 7] (#643)

Added More Test Cases:

1. TTL with a unique index
2. TTL with a disk column table
3. TTL with backup & restore
4. TTL with a foreign key,
   TTL has several design conflicts with foreign keys. The current
   solution is to forbid foreign keys when TTL is enabled.
   However, the related test cases have already been added and can be
   enabled once foreign key support is implemented in the future.
Note:
1. TTL testing on the data node is complete, but more tests will be added over time.
2. TTL purging on RDRS2 requires additional testing; further considerations will be made.

include/my_base.h

@@ -428,6 +428,7 @@ enum ha_extra_function {
    */
   HA_EXTRA_IGNORE_TTL,
   HA_EXTRA_NO_IGNORE_TTL,
+  HA_EXTRA_FK_TTL
 };
 
 /* Compatible option, to be deleted in 6.0 */