/*
* Find scan method hint to be applied to the given relation
+ *
*/
static ScanMethodHint *
-find_scan_hint(PlannerInfo *root, Index relid, RelOptInfo *rel)
+find_scan_hint(PlannerInfo *root, Index relid)
{
+ RelOptInfo *rel;
RangeTblEntry *rte;
+ ScanMethodHint *real_name_hint = NULL;
+ ScanMethodHint *alias_hint = NULL;
int i;
+ /* This should not be a join rel */
+ Assert(relid > 0);
+ rel = root->simple_rel_array[relid];
+
/*
- * We don't apply scan method hint if the relation is:
- * - not a base relation
- * - not an ordinary relation (such as join and subquery)
+ * This function is called for any RelOptInfo or its inheritance parent if
+ * any. If we are called from inheritance planner, the RelOptInfo for the
+ * parent of target child relation is not set in the planner info.
+ *
+ * Otherwise we should check that the reloptinfo is base relation or
+ * inheritance children.
*/
- if (rel && (rel->reloptkind != RELOPT_BASEREL ||
- rel->rtekind != RTE_RELATION))
+ if (rel &&
+ rel->reloptkind != RELOPT_BASEREL &&
+ rel->reloptkind != RELOPT_OTHER_MEMBER_REL)
return NULL;
+ /*
+ * This is baserel or appendrel children. We can refer to RangeTblEntry.
+ */
rte = root->simple_rte_array[relid];
+ Assert(rte);
- /* We don't force scan method of foreign tables */
- if (rte->relkind == RELKIND_FOREIGN_TABLE)
+ /* We don't hint on other than relation and foreign tables */
+ if (rte->rtekind != RTE_RELATION ||
+ rte->relkind == RELKIND_FOREIGN_TABLE)
return NULL;
/* Find scan method hint, which matches given names, from the list. */
if (!hint_state_enabled(hint))
continue;
- if (RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
- return hint;
+ if (!alias_hint &&
+ RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
+ alias_hint = hint;
+
+ /* check the real name for appendrel children */
+ if (!real_name_hint &&
+ rel && rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
+ {
+ char *realname = get_rel_name(rte->relid);
+
+ if (realname && RelnameCmp(&realname, &hint->relname) == 0)
+ real_name_hint = hint;
+ }
+
+ /* No more match expected, break */
+ if(alias_hint && real_name_hint)
+ break;
}
- return NULL;
+ /* real name match precedes alias match */
+ if (real_name_hint)
+ return real_name_hint;
+
+ return alias_hint;
}
static ParallelHint *
-find_parallel_hint(PlannerInfo *root, Index relid, RelOptInfo *rel)
+find_parallel_hint(PlannerInfo *root, Index relid)
{
+ RelOptInfo *rel;
RangeTblEntry *rte;
+ ParallelHint *real_name_hint = NULL;
+ ParallelHint *alias_hint = NULL;
int i;
+ /* This should not be a join rel */
+ Assert(relid > 0);
+ rel = root->simple_rel_array[relid];
+
/*
- * We don't apply scan method hint if the relation is:
- * - not a base relation and inheritance children
- * - not an ordinary relation (such as join and subquery)
+ * This function is called for any RelOptInfo or its inheritance parent if
+ * any. If we are called from inheritance planner, the RelOptInfo for the
+ * parent of target child relation is not set in the planner info.
+ *
+ * Otherwise we should check that the reloptinfo is base relation or
+ * inheritance children.
*/
- if (!rel || rel->rtekind != RTE_RELATION ||
- (rel->reloptkind != RELOPT_BASEREL &&
- rel->reloptkind != RELOPT_OTHER_MEMBER_REL))
+ if (rel &&
+ rel->reloptkind != RELOPT_BASEREL &&
+ rel->reloptkind != RELOPT_OTHER_MEMBER_REL)
return NULL;
+ /*
+ * This is baserel or appendrel children. We can refer to RangeTblEntry.
+ */
rte = root->simple_rte_array[relid];
+ Assert(rte);
- /* We can't force scan method of foreign tables */
- if (rte->relkind == RELKIND_FOREIGN_TABLE)
+ /* We don't hint on other than relation and foreign tables */
+ if (rte->rtekind != RTE_RELATION ||
+ rte->relkind == RELKIND_FOREIGN_TABLE)
return NULL;
- /* Find scan method hint, which matches given names, from the list. */
+ /* Find parallel method hint, which matches given names, from the list. */
for (i = 0; i < current_hint_state->num_hints[HINT_TYPE_PARALLEL]; i++)
{
ParallelHint *hint = current_hint_state->parallel_hints[i];
if (!hint_state_enabled(hint))
continue;
- if (RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
- return hint;
+ if (!alias_hint &&
+ RelnameCmp(&rte->eref->aliasname, &hint->relname) == 0)
+ alias_hint = hint;
+
+ /* check the real name for appendrel children */
+ if (!real_name_hint &&
+ rel && rel->reloptkind == RELOPT_OTHER_MEMBER_REL)
+ {
+ char *realname = get_rel_name(rte->relid);
+
+ if (realname && RelnameCmp(&realname, &hint->relname) == 0)
+ real_name_hint = hint;
+ }
+
+ /* No more match expected, break */
+ if(alias_hint && real_name_hint)
+ break;
}
- return NULL;
+ /* real name match precedes alias match */
+ if (real_name_hint)
+ return real_name_hint;
+
+ return alias_hint;
}
/*
/* Find hints for the parent */
current_hint_state->parent_scan_hint =
- find_scan_hint(root, current_hint_state->parent_relid, NULL);
+ find_scan_hint(root, current_hint_state->parent_relid);
current_hint_state->parent_parallel_hint =
- find_parallel_hint(root, current_hint_state->parent_relid, NULL);
+ find_parallel_hint(root, current_hint_state->parent_relid);
/*
* If hint is found for the parent, apply it for this child instead
}
}
- if (current_hint_state->parent_scan_hint)
+ shint = find_scan_hint(root, rel->relid);
+ if (!shint)
shint = current_hint_state->parent_scan_hint;
- else
- shint = find_scan_hint(root, rel->relid, rel);
if (shint)
{
}
/* Do the same for parallel plan enforcement */
- if (current_hint_state->parent_parallel_hint)
+ phint = find_parallel_hint(root, rel->relid);
+ if (!phint)
phint = current_hint_state->parent_parallel_hint;
- else
- phint = find_parallel_hint(root, rel->relid, rel);
setup_parallel_plan_enforcement(phint, current_hint_state);
if (debug_level > 1)
ereport(pg_hint_plan_message_level,
(errhidestmt (true),
- errmsg ("pg_hint_plan%s: get_relation_info"
+ errmsg ("pg_hint_plan%s: setup_hint_enforcement"
" no hint applied:"
" relation=%u(%s), inhparent=%d, current_hint=%p,"
" hint_inhibit_level=%d, scanmask=0x%x",
SpecialJoinInfo *sjinfo,
List *restrictlist)
{
- ScanMethodHint *scan_hint = NULL;
Relids joinrelids;
JoinMethodHint *join_hint;
int save_nestlevel;
- if ((scan_hint = find_scan_hint(root, innerrel->relid, innerrel)) != NULL)
- setup_scan_method_enforcement(scan_hint, current_hint_state);
-
joinrelids = bms_union(outerrel->relids, innerrel->relids);
join_hint = find_join_hint(joinrelids);
bms_free(joinrelids);
else
add_paths_to_joinrel(root, joinrel, outerrel, innerrel, jointype,
sjinfo, restrictlist);
-
- /* Reset the environment if changed */
- if (scan_hint != NULL)
- setup_scan_method_enforcement(NULL, current_hint_state);
}
static int
/* Here, we regenerate paths with the current hint restriction */
- /* Remove prviously paths except dummy rels */
+ /* Remove prviously generated paths */
list_free_deep(rel->pathlist);
rel->pathlist = NIL;
* estimated number of workers. Force the requested number of workers if
* hard mode.
*/
- phint = find_parallel_hint(root, rel->relid, rel);
+ phint = find_parallel_hint(root, rel->relid);
if (phint)
{
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