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Add a relkind field to RangeTblEntry to avoid some syscache lookups.

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The recent additions for FDW support required checking foreign-table-ness
in several places in the parse/plan chain.  While it's not clear whether
that would really result in a noticeable slowdown, it seems best to avoid
any performance risk by keeping a copy of the relation's relkind in
RangeTblEntry.  That might have some other uses later, anyway.
Per discussion.
This commit is contained in:
Tom Lane
2011-02-22 19:23:23 -05:00
parent 1c51c7d5ff
commit bdca82f44d
19 changed files with 85 additions and 74 deletions
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67
src/backend/optimizer/path/allpaths.c
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@ -176,41 +176,44 @@ set_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
/* It's an "append relation", process accordingly */
set_append_rel_pathlist(root, rel, rti, rte);
}
else if (rel->rtekind == RTE_SUBQUERY)
{
/* Subquery --- generate a separate plan for it */
set_subquery_pathlist(root, rel, rti, rte);
}
else if (rel->rtekind == RTE_FUNCTION)
{
/* RangeFunction --- generate a suitable path for it */
set_function_pathlist(root, rel, rte);
}
else if (rel->rtekind == RTE_VALUES)
{
/* Values list --- generate a suitable path for it */
set_values_pathlist(root, rel, rte);
}
else if (rel->rtekind == RTE_CTE)
{
/* CTE reference --- generate a suitable path for it */
if (rte->self_reference)
set_worktable_pathlist(root, rel, rte);
else
set_cte_pathlist(root, rel, rte);
}
else
{
Assert(rel->rtekind == RTE_RELATION);
if (get_rel_relkind(rte->relid) == RELKIND_FOREIGN_TABLE)
switch (rel->rtekind)
{
/* Foreign table */
set_foreign_pathlist(root, rel, rte);
}
else
{
/* Plain relation */
set_plain_rel_pathlist(root, rel, rte);
case RTE_RELATION:
if (rte->relkind == RELKIND_FOREIGN_TABLE)
{
/* Foreign table */
set_foreign_pathlist(root, rel, rte);
}
else
{
/* Plain relation */
set_plain_rel_pathlist(root, rel, rte);
}
break;
case RTE_SUBQUERY:
/* Subquery --- generate a separate plan for it */
set_subquery_pathlist(root, rel, rti, rte);
break;
case RTE_FUNCTION:
/* RangeFunction --- generate a suitable path for it */
set_function_pathlist(root, rel, rte);
break;
case RTE_VALUES:
/* Values list --- generate a suitable path for it */
set_values_pathlist(root, rel, rte);
break;
case RTE_CTE:
/* CTE reference --- generate a suitable path for it */
if (rte->self_reference)
set_worktable_pathlist(root, rel, rte);
else
set_cte_pathlist(root, rel, rte);
break;
default:
elog(ERROR, "unexpected rtekind: %d", (int) rel->rtekind);
break;
}
}