Comment 5 for bug 432210

Well, the call to build_completion_hash() is optional. Whether it is called or not is determined by the startup options that are passed to drizzled.

The startup option that controls it is opt_rehash as you can see from this block:

if (opt_rehash)
  com_rehash(NULL, NULL);

Looking at the description of this option, we see:

{"auto-rehash", OPT_AUTO_REHASH,
   N_("Enable automatic rehashing. One doesn't need to use 'rehash' to get table and field completion, but startup and reconnecting may take a longer time. Disable with --disable-auto-rehash."),
   (char**) &opt_rehash, (char**) &opt_rehash, 0, GET_BOOL, NO_ARG, 1, 0, 0, 0,
   0, 0}

So if you pass the --disable-auto-rehash option to drizzled on startup, build_completion_hash() will not get called from the reconnect() method.

-Padraig