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Guard against parallel-restricted functions in VALUES expressions.

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Obvious brain fade in set_rel_consider_parallel().  Noticed it while
adjusting the adjacent RTE_FUNCTION case.

In 9.6, also make the code look more like what I just did in HEAD
by removing the unnecessary function_rte_parallel_ok subroutine
(it does nothing that expression_tree_walker wouldn't do).
This commit is contained in:
Tom Lane 2016-08-19 14:35:32 -04:00
parent 0440f49523
commit c3813268a7
1 changed files with 4 additions and 27 deletions
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31
src/backend/optimizer/path/allpaths.c
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@ -78,7 +78,6 @@ static void set_plain_rel_size(PlannerInfo *root, RelOptInfo *rel,
static void create_plain_partial_paths(PlannerInfo *root, RelOptInfo *rel);
static void set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
RangeTblEntry *rte);
static bool function_rte_parallel_ok(RangeTblEntry *rte);
static void set_plain_rel_pathlist(PlannerInfo *root, RelOptInfo *rel,
RangeTblEntry *rte);
static void set_tablesample_rel_size(PlannerInfo *root, RelOptInfo *rel,
@ -596,16 +595,14 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
case RTE_FUNCTION:
/* Check for parallel-restricted functions. */
if (!function_rte_parallel_ok(rte))
if (has_parallel_hazard((Node *) rte->functions, false))
return;
break;
case RTE_VALUES:
/*
* The data for a VALUES clause is stored in the plan tree itself,
* so scanning it in a worker is fine.
*/
/* Check for parallel-restricted functions. */
if (has_parallel_hazard((Node *) rte->values_lists, false))
return;
break;
case RTE_CTE:
@ -643,26 +640,6 @@ set_rel_consider_parallel(PlannerInfo *root, RelOptInfo *rel,
rel->consider_parallel = true;
}
/*
* Check whether a function RTE is scanning something parallel-restricted.
*/
static bool
function_rte_parallel_ok(RangeTblEntry *rte)
{
ListCell *lc;
foreach(lc, rte->functions)
{
RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
Assert(IsA(rtfunc, RangeTblFunction));
if (has_parallel_hazard(rtfunc->funcexpr, false))
return false;
}
return true;
}
/*
* set_plain_rel_pathlist
* Build access paths for a plain relation (no subquery, no inheritance)