Changeset: d0667b92bede for MonetDB
URL: https://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=d0667b92bede
Modified Files:
sql/server/rel_optimizer.c
sql/server/rel_select.c
Branch: Jul2017
Log Message:
fixed problem in dead code optimizer, ie handle the referenced sub queries
in the proper order.
diffs (280 lines):
diff --git a/sql/server/rel_optimizer.c b/sql/server/rel_optimizer.c
--- a/sql/server/rel_optimizer.c
+++ b/sql/server/rel_optimizer.c
@@ -6078,43 +6078,20 @@ rel_remove_unused(mvc *sql, sql_rel *rel
return rel;
}
-static list *
-merge_refs(list *l, list *r)
-{
- node *n, *m, *np = l->h, *mp = r->h;
- list *nl = sa_list(l->sa);
-
- for( n = np; n; n = n->next) {
- sql_rel *lr = n->data;
- for (m = mp; m; m = m->next) {
- sql_rel *rr = m->data;
-
- if (lr == rr) {
- for( ; np != n; np = np->next)
- append(nl, np->data);
- np = np->next;
- for( ; mp != m; mp = mp->next)
- append(nl, mp->data);
- append(nl, mp->data);
- mp = mp->next;
- break;
- }
- }
- }
- for( ; np; np = np->next)
- append(nl, np->data);
- for( ; mp; mp = mp->next)
- append(nl, mp->data);
- return nl;
-}
-
-static list *
-rel_dce_refs(mvc *sql, sql_rel *rel)
-{
- list *l = NULL, *r = NULL;
-
- if (!rel)
- return NULL;
+static void
+rel_dep_graph( char *deps, list *refs, sql_rel *parent, sql_rel *rel)
+{
+ if (!parent)
+ return ;
+
+ if (rel_is_ref(rel) && parent != rel) {
+ int n = list_length(refs);
+ int pnr = list_position(refs, parent);
+ int cnr = list_position(refs, rel);
+
+ deps[pnr*n + cnr] = 1;
+ parent = rel;
+ }
switch(rel->op) {
case op_table:
@@ -6125,7 +6102,7 @@ rel_dce_refs(mvc *sql, sql_rel *rel)
case op_select:
if (rel->l && (rel->op != op_table || rel->flag != 2))
- l = rel_dce_refs(sql, rel->l);
+ rel_dep_graph(deps, refs, parent, rel->l);
case op_basetable:
case op_insert:
@@ -6136,7 +6113,7 @@ rel_dce_refs(mvc *sql, sql_rel *rel)
case op_delete:
if (rel->r)
- r = rel_dce_refs(sql, rel->r);
+ rel_dep_graph(deps, refs, parent, rel->r);
break;
@@ -6151,25 +6128,152 @@ rel_dce_refs(mvc *sql, sql_rel *rel)
case op_anti:
if (rel->l)
- l = rel_dce_refs(sql, rel->l);
+ rel_dep_graph(deps, refs, parent, rel->l);
if (rel->r)
- r = rel_dce_refs(sql, rel->r);
+ rel_dep_graph(deps, refs, parent, rel->r);
break;
case op_apply:
assert(0);
}
-
- if (l && r)
- l = merge_refs(l, r);
- if (!l)
- l = r;
- if (rel_is_ref(rel)) {
- if (!l)
- l = sa_list(sql->sa);
- list_prepend(l, rel);
- }
- return l;
+}
+
+/*
+extern void _rel_print(mvc *sql, sql_rel *rel);
+
+static void
+print_deps(mvc *sql, char *deps, list *refs)
+{
+ int i, j;
+ int n = list_length(refs);
+
+ for (i=0; i<n; i++) {
+ sql_rel *r = list_fetch(refs, i);
+ printf("dep %d\n", i);
+ _rel_print(sql,r);
+ }
+ for (i=0; i<n; i++) {
+ for (j=0; j<n; j++) {
+ printf("%c ", i==j?'x' : deps[i*n + j]?'1':'0');
+ }
+ printf("\n");
+ }
+
+}
+*/
+
+static int
+depends_on(int nr, char *deps, int n, int dnr)
+{
+ for(;dnr < n; dnr++) {
+ if (dnr == nr)
+ dnr++;
+ if (deps[nr*n + dnr])
+ return dnr;
+ }
+ return -1;
+}
+
+static void
+flatten_dep(list *nrefs, list *refs, int nr, char *deps, int n)
+{
+ int dnr = 0;
+
+ if (deps[nr*n + nr])
+ return;
+ for (;(dnr = depends_on(nr, deps, n, dnr)) >= 0 && dnr < n; dnr++)
+ flatten_dep(nrefs, refs, dnr, deps, n);
+ if (!deps[nr*n + nr]) {
+ list_prepend(nrefs, list_fetch(refs,nr));
+ deps[nr*n+nr] = 1; /* mark done */
+ }
+}
+
+static list *
+flatten_dep_graph(mvc *sql, char *deps, list *refs)
+{
+ list *nrefs = sa_list(sql->sa);
+ int n = list_length(refs), nr = 0;
+
+ for (nr = 0; nr < n; nr++) {
+ if (deps[nr*n + nr])
+ continue;
+ flatten_dep(nrefs, refs, nr, deps, n);
+ }
+ return nrefs;
+}
+
+static list *
+rel_dependencies(mvc *sql, list *refs)
+{
+ int n = list_length(refs);
+
+ if (n > 1) {
+ char *deps = SA_NEW_ARRAY(sql->sa, char, n*n);
+ node *m;
+
+ memset(deps, 0, n*n);
+ for (m = refs->h; m; m = m->next) {
+ rel_dep_graph(deps, refs, m->data, m->data);
+ }
+ refs = flatten_dep_graph(sql, deps, refs);
+ //print_deps(sql, deps, refs);
+ }
+ return refs;
+}
+
+static void
+rel_dce_refs(mvc *sql, sql_rel *rel, list *refs)
+{
+ if (!rel)
+ return ;
+
+ switch(rel->op) {
+ case op_table:
+ case op_topn:
+ case op_sample:
+ case op_project:
+ case op_groupby:
+ case op_select:
+
+ if (rel->l && (rel->op != op_table || rel->flag != 2))
+ rel_dce_refs(sql, rel->l, refs);
+
+ case op_basetable:
+ case op_insert:
+ case op_ddl:
+ break;
+
+ case op_update:
+ case op_delete:
+
+ if (rel->r)
+ rel_dce_refs(sql, rel->r, refs);
+ break;
+
+
+ case op_union:
+ case op_inter:
+ case op_except:
+ case op_join:
+ case op_left:
+ case op_right:
+ case op_full:
+ case op_semi:
+ case op_anti:
+
+ if (rel->l)
+ rel_dce_refs(sql, rel->l, refs);
+ if (rel->r)
+ rel_dce_refs(sql, rel->r, refs);
+ break;
+
+ case op_apply:
+ assert(0);
+ }
+
+ if (rel_is_ref(rel) && !list_find(refs, rel, NULL))
+ list_prepend(refs, rel);
}
static sql_rel *
@@ -6348,17 +6452,19 @@ rel_add_projects(mvc *sql, sql_rel *rel)
sql_rel *
rel_dce(mvc *sql, sql_rel *rel)
{
- list *refs;
+ list *refs = sa_list(sql->sa);
node *n;
- refs = rel_dce_refs(sql, rel);
+ rel_dce_refs(sql, rel, refs);
rel = rel_add_projects(sql, rel);
rel_used(rel);
rel_dce_sub(sql, rel, refs);
- if (refs)
+ if (refs) {
+ refs = rel_dependencies(sql, refs);
for (n = refs->h; n; n = n->next)
rel_dce_sub(sql, n->data, refs);
+ }
return rel;
}
diff --git a/sql/server/rel_select.c b/sql/server/rel_select.c
--- a/sql/server/rel_select.c
+++ b/sql/server/rel_select.c
@@ -210,6 +210,8 @@ rel_table_optname(mvc *sql, sql_rel *sq,
list *l = sa_list(sql->sa);
columnrefs = optname->data.lval->h->next->data.lval;
+ if (!is_project(sq->op) && !is_base(sq->op))
+ sq = rel_project(sql->sa, sq, rel_projections(sql, sq,
NULL, 1, 1));
if (columnrefs && sq->exps) {
dnode *d = columnrefs->h;
node *ne = sq->exps->h;
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