dbJoin
rc = dbJoin(tp, word,
rc = dbJoin(tp, word, size, false);
rc = dbJoin((dmtree_t *) dcp, leafno, newval, true);
dbJoin((dmtree_t *) dcp, leafno,
static int dbJoin(dmtree_t *tp, int leafno, int newval, bool is_ctl);