sql_exp*
exp_label(sql_allocator *sa, sql_exp *e, int nr)
{
char name[16], *nme;
nme = number2name(name, 16, nr);
e->name = sa_strdup(sa, nme);
return e;
}
/* return val;
*/
static list *
rel_psm_return( mvc *sql, sql_subtype *restype, list *restypelist, symbol *return_sym )
{
exp_kind ek = {type_value, card_value, FALSE};
sql_exp *res;
sql_rel *rel = NULL;
int is_last = 0;
list *l = sa_list(sql->sa);
if (restypelist)
ek.card = card_relation;
res = rel_value_exp2(sql, &rel, return_sym, sql_sel, ek, &is_last);
if (!res)
return NULL;
if (ek.card != card_relation && (!res ||
(res = rel_check_type(sql, restype, res, type_equal)) == NULL))
return NULL;
else if (ek.card == card_relation && !rel)
return NULL;
if (rel && ek.card != card_relation)
append(l, exp_rel(sql, rel));
else if (rel && !is_ddl(rel->op)) {
list *exps = sa_list(sql->sa);
node *n, *m;
int isproject = (rel->op == op_project);
list *oexps = rel->exps;
sql_rel *l = rel->l;
if (is_topn(rel->op))
oexps = l->exps;
for (n = oexps->h, m = restypelist->h; n && m; n = n->next, m = m->next) {
sql_exp *e = n->data;
sql_arg *ce = m->data;
char *cname = exp_name(e);
char name[16];
if (!cname)
cname = sa_strdup(sql->sa, number2name(name, 16, ++sql->label));
if (!isproject)
e = exp_column(sql->sa, exp_relname(e), cname, exp_subtype(e), exp_card(e), has_nil(e), is_intern(e));
e = rel_check_type(sql, &ce->type, e, type_equal);
if (!e)
return NULL;
append(exps, e);
}
if (isproject)
rel -> exps = exps;
else
rel = rel_project(sql->sa, rel, exps);
res = exp_rel(sql, rel);
} else if (rel && restypelist){ /* handle return table-var */
list *exps = sa_list(sql->sa);
sql_table *t = rel_ddl_table_get(rel);
node *n, *m;
char *tname = t->base.name;
if (cs_size(&t->columns) != list_length(restypelist))
return sql_error(sql, 02, "RETURN: number of columns do not match");
for (n = t->columns.set->h, m = restypelist->h; n && m; n = n->next, m = m->next) {
sql_column *c = n->data;
sql_arg *ce = m->data;
sql_exp *e = exp_alias(sql->sa, tname, c->base.name, tname, c->base.name, &c->type, CARD_MULTI, c->null, 0);
e = rel_check_type(sql, &ce->type, e, type_equal);
if (!e)
return NULL;
append(exps, e);
}
rel = rel_project(sql->sa, rel, exps);
res = exp_rel(sql, rel);
}
append(l, exp_return(sql->sa, res, stack_nr_of_declared_tables(sql)));
return l;
}
