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Small improvements to OPTIMIZER_DEBUG code.

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Now that Paths have their own rows field, print that rather than
the parent relation's rowcount.

Show the relid sets associated with Paths using table names rather
than numbers; since this code is able to print simple Var references
using table names, it seems a bit silly that print_relids can't.

Print the cheapest_parameterized_paths list for a RelOptInfo, and
include information about a parameterized path's required_outer rels.

Noted while trying to use this feature to debug Alexander Kirkouski's
recent bug report.
This commit is contained in:
Tom Lane 2016-04-30 14:08:00 -04:00
parent c45bf5751b
commit 2a2435e699
1 changed files with 23 additions and 6 deletions
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27
src/backend/optimizer/path/allpaths.c
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@ -2829,7 +2829,7 @@ remove_unused_subquery_outputs(Query *subquery, RelOptInfo *rel)
#ifdef OPTIMIZER_DEBUG
static void
print_relids(Relids relids)
print_relids(PlannerInfo *root, Relids relids)
{
int x;
bool first = true;
@ -2839,6 +2839,10 @@ print_relids(Relids relids)
{
if (!first)
printf(" ");
if (x < root->simple_rel_array_size &&
root->simple_rte_array[x])
printf("%s", root->simple_rte_array[x]->eref->aliasname);
else
printf("%d", x);
first = false;
}
@ -3013,10 +3017,17 @@ print_path(PlannerInfo *root, Path *path, int indent)
if (path->parent)
{
printf("(");
print_relids(path->parent->relids);
printf(") rows=%.0f", path->parent->rows);
print_relids(root, path->parent->relids);
printf(")");
}
printf(" cost=%.2f..%.2f\n", path->startup_cost, path->total_cost);
if (path->param_info)
{
printf(" required_outer (");
print_relids(root, path->param_info->ppi_req_outer);
printf(")");
}
printf(" rows=%.0f cost=%.2f..%.2f\n",
path->rows, path->startup_cost, path->total_cost);
if (path->pathkeys)
{
@ -3062,7 +3073,7 @@ debug_print_rel(PlannerInfo *root, RelOptInfo *rel)
ListCell *l;
printf("RELOPTINFO (");
print_relids(rel->relids);
print_relids(root, rel->relids);
printf("): rows=%.0f width=%d\n", rel->rows, rel->reltarget->width);
if (rel->baserestrictinfo)
@ -3082,6 +3093,12 @@ debug_print_rel(PlannerInfo *root, RelOptInfo *rel)
printf("\tpath list:\n");
foreach(l, rel->pathlist)
print_path(root, lfirst(l), 1);
if (rel->cheapest_parameterized_paths)
{
printf("\n\tcheapest parameterized paths:\n");
foreach(l, rel->cheapest_parameterized_paths)
print_path(root, lfirst(l), 1);
}
if (rel->cheapest_startup_path)
{
printf("\n\tcheapest startup path:\n");