static char*
get_strings_by_bit (const char *pkeywords, const long long int num ) //根据比特位对相应字符取反
{
char *back = NULL;
int lens = strlen(pkeywords);
back = (char*)malloc(lens + 1);
memset(back, '\0', lens + 1);
int i = 0;
for(i = 0; i < lens ; i++)
{
long long int is_bit_true = pow(2, i);
if((is_bit_true&num) != 0)
{
back[i] = is_anti(pkeywords[i]);
}
else
{
back[i] = pkeywords[i];
}
}
back[lens] = '\0';
return back;
} /* ----- end of function get_strings_by_bit ----- */
sql_exp *
exp_copy( sql_allocator *sa, sql_exp * e)
{
sql_exp *l, *r, *r2, *ne = NULL;
switch(e->type){
case e_column:
ne = exp_column(sa, e->l, e->r, exp_subtype(e), e->card, has_nil(e), is_intern(e));
ne->flag = e->flag;
break;
case e_cmp:
if (e->flag == cmp_or) {
list *l = exps_copy(sa, e->l);
list *r = exps_copy(sa, e->r);
if (l && r)
ne = exp_or(sa, l,r);
} else if (e->flag == cmp_in || e->flag == cmp_notin || get_cmp(e) == cmp_filter) {
sql_exp *l = exp_copy(sa, e->l);
list *r = exps_copy(sa, e->r);
if (l && r) {
if (get_cmp(e) == cmp_filter)
ne = exp_filter(sa, l, r, e->f, is_anti(e));
else
ne = exp_in(sa, l, r, e->flag);
}
} else {
l = exp_copy(sa, e->l);
r = exp_copy(sa, e->r);
if (e->f) {
r2 = exp_copy(sa, e->f);
if (l && r && r2)
ne = exp_compare2(sa, l, r, r2, e->flag);
} else if (l && r) {
ne = exp_compare(sa, l, r, e->flag);
}
}
break;
case e_convert:
l = exp_copy(sa, e->l);
if (l)
ne = exp_convert(sa, l, exp_fromtype(e), exp_totype(e));
break;
case e_aggr:
case e_func: {
list *l = e->l, *nl = NULL;
if (!l) {
return e;
} else {
nl = exps_copy(sa, l);
if (!nl)
return NULL;
}
if (e->type == e_func)
ne = exp_op(sa, nl, e->f);
else
ne = exp_aggr(sa, nl, e->f, need_distinct(e), need_no_nil(e), e->card, has_nil(e));
break;
}
case e_atom:
if (e->l)
ne = exp_atom(sa, e->l);
else if (!e->r)
ne = exp_atom_ref(sa, e->flag, &e->tpe);
else
ne = exp_param(sa, e->r, &e->tpe, e->flag);
break;
case e_psm:
if (e->flag == PSM_SET)
ne = exp_set(sa, e->name, exp_copy(sa, e->l), GET_PSM_LEVEL(e->flag));
break;
}
if (ne && e->p)
ne->p = prop_copy(sa, e->p);
if (e->name)
exp_setname(sa, ne, exp_find_rel_name(e), exp_name(e));
return ne;
}