Changeset: ea0b21aeaf5b for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB/rev/ea0b21aeaf5b
Modified Files:
sql/server/rel_updates.c
Branch: Jan2022
Log Message:
when inserting complex rows, convert into a union of rows.
diffs (66 lines):
diff --git a/sql/server/rel_updates.c b/sql/server/rel_updates.c
--- a/sql/server/rel_updates.c
+++ b/sql/server/rel_updates.c
@@ -322,6 +322,7 @@ rel_inserts(mvc *sql, sql_table *t, sql_
sql_exp **inserts = insert_exp_array(sql, t, &len);
list *exps = NULL;
node *n, *m;
+ bool has_rel = false, all_values = true;
if (r->exps) {
if (!copy) {
@@ -333,6 +334,8 @@ rel_inserts(mvc *sql, sql_table *t, sql_
return sql_error(sql, 02,
SQLSTATE(42000) "%s: column '%s' specified more than once", action,
c->base.name);
if (!(inserts[c->colnr] = exp_check_type(sql,
&c->type, r, e, type_equal)))
return NULL;
+ has_rel = (has_rel || exp_has_rel(e));
+ all_values &= is_values(e);
}
} else {
for (m = collist->h; m; m = m->next) {
@@ -344,6 +347,8 @@ rel_inserts(mvc *sql, sql_table *t, sql_
if (inserts[c->colnr])
return sql_error(sql, 02,
SQLSTATE(42000) "%s: column '%s' specified more than once", action,
c->base.name);
inserts[c->colnr] = exp_ref(sql, e);
+ has_rel = has_rel || exp_has_rel(e);
+ all_values &= is_values(e);
}
}
}
@@ -384,10 +389,32 @@ rel_inserts(mvc *sql, sql_table *t, sql_
assert(inserts[c->colnr]);
}
}
- /* now rewrite project exps in proper table order */
- exps = new_exp_list(sql->sa);
- for (i = 0; i<len; i++)
- list_append(exps, inserts[i]);
+ /* rewrite into unions */
+ if (has_rel && rowcount && all_values) {
+ sql_rel *c = NULL;
+ for (size_t j = 0; j < rowcount; j++) {
+ sql_rel *p = rel_project(sql->sa, NULL,
sa_list(sql->sa));
+ for (m = ol_first_node(t->columns); m; m = m->next) {
+ sql_column *c = m->data;
+ sql_exp *e = inserts[c->colnr];
+ assert(is_values(e));
+ list *vals = e->f;
+ append(p->exps, list_fetch(vals, j));
+ }
+ if (c) {
+ c = rel_setop(sql->sa, c, p, op_union);
+ rel_setop_set_exps(sql, c, rel_projections(sql,
c->l, NULL, 1, 1), false);
+ } else
+ c = p;
+ }
+ r->l = c;
+ exps = rel_projections(sql, r->l, NULL, 1, 1);
+ } else {
+ /* now rewrite project exps in proper table order */
+ exps = new_exp_list(sql->sa);
+ for (i = 0; i<len; i++)
+ list_append(exps, inserts[i]);
+ }
return exps;
}
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