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Commit6b661b0

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Remove local optimizations of empty Bitmapsets into null pointers.
These are all dead code now that it's done centrally.Patch by me; thanks to Nathan Bossart and Richard Guo for review.Discussion:https://postgr.es/m/1159933.1677621588@sss.pgh.pa.us
1 parent00b4146 commit6b661b0

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9 files changed

+9
-64
lines changed

9 files changed

+9
-64
lines changed

‎src/backend/executor/execUtils.c

Lines changed: 1 addition & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -877,15 +877,7 @@ UpdateChangedParamSet(PlanState *node, Bitmapset *newchg)
877877
* include anything else into its chgParam set.
878878
*/
879879
parmset=bms_intersect(node->plan->allParam,newchg);
880-
881-
/*
882-
* Keep node->chgParam == NULL if there's not actually any members; this
883-
* allows the simplest possible tests in executor node files.
884-
*/
885-
if (!bms_is_empty(parmset))
886-
node->chgParam=bms_join(node->chgParam,parmset);
887-
else
888-
bms_free(parmset);
880+
node->chgParam=bms_join(node->chgParam,parmset);
889881
}
890882

891883
/*

‎src/backend/optimizer/path/indxpath.c

Lines changed: 0 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -949,9 +949,6 @@ build_index_paths(PlannerInfo *root, RelOptInfo *rel,
949949

950950
/* We do not want the index's rel itself listed in outer_relids */
951951
outer_relids=bms_del_member(outer_relids,rel->relid);
952-
/* Enforce convention that outer_relids is exactly NULL if empty */
953-
if (bms_is_empty(outer_relids))
954-
outer_relids=NULL;
955952

956953
/* Compute loop_count for cost estimation purposes */
957954
loop_count=get_loop_count(root,rel->relid,outer_relids);

‎src/backend/optimizer/plan/initsplan.c

Lines changed: 2 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -679,16 +679,10 @@ create_lateral_join_info(PlannerInfo *root)
679679

680680
/* Nothing to do at rels with no lateral refs */
681681
lateral_relids=brel->lateral_relids;
682-
if (lateral_relids==NULL)
682+
if (bms_is_empty(lateral_relids))
683683
continue;
684684

685-
/*
686-
* We should not have broken the invariant that lateral_relids is
687-
* exactly NULL if empty.
688-
*/
689-
Assert(!bms_is_empty(lateral_relids));
690-
691-
/* Also, no rel should have a lateral dependency on itself */
685+
/* No rel should have a lateral dependency on itself */
692686
Assert(!bms_is_member(rti,lateral_relids));
693687

694688
/* Mark this rel's referencees */

‎src/backend/optimizer/plan/subselect.c

Lines changed: 0 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -2825,15 +2825,6 @@ finalize_plan(PlannerInfo *root, Plan *plan,
28252825
/* but not any initplan setParams */
28262826
plan->extParam=bms_del_members(plan->extParam,initSetParam);
28272827

2828-
/*
2829-
* For speed at execution time, make sure extParam/allParam are actually
2830-
* NULL if they are empty sets.
2831-
*/
2832-
if (bms_is_empty(plan->extParam))
2833-
plan->extParam=NULL;
2834-
if (bms_is_empty(plan->allParam))
2835-
plan->allParam=NULL;
2836-
28372828
returnplan->allParam;
28382829
}
28392830

‎src/backend/optimizer/util/pathnode.c

Lines changed: 0 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2372,12 +2372,6 @@ calc_nestloop_required_outer(Relids outerrelids,
23722372
/* ... and remove any mention of now-satisfied outer rels */
23732373
required_outer=bms_del_members(required_outer,
23742374
outerrelids);
2375-
/* maintain invariant that required_outer is exactly NULL if empty */
2376-
if (bms_is_empty(required_outer))
2377-
{
2378-
bms_free(required_outer);
2379-
required_outer=NULL;
2380-
}
23812375
returnrequired_outer;
23822376
}
23832377

‎src/backend/optimizer/util/placeholder.c

Lines changed: 0 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -125,8 +125,6 @@ find_placeholder_info(PlannerInfo *root, PlaceHolderVar *phv)
125125
*/
126126
rels_used=pull_varnos(root, (Node*)phv->phexpr);
127127
phinfo->ph_lateral=bms_difference(rels_used,phv->phrels);
128-
if (bms_is_empty(phinfo->ph_lateral))
129-
phinfo->ph_lateral=NULL;/* make it exactly NULL if empty */
130128
phinfo->ph_eval_at=bms_int_members(rels_used,phv->phrels);
131129
/* If no contained vars, force evaluation at syntactic location */
132130
if (bms_is_empty(phinfo->ph_eval_at))

‎src/backend/optimizer/util/relnode.c

Lines changed: 0 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -772,8 +772,6 @@ build_join_rel(PlannerInfo *root,
772772
*/
773773
joinrel->direct_lateral_relids=
774774
bms_del_members(joinrel->direct_lateral_relids,joinrel->relids);
775-
if (bms_is_empty(joinrel->direct_lateral_relids))
776-
joinrel->direct_lateral_relids=NULL;
777775

778776
/*
779777
* Construct restrict and join clause lists for the new joinrel. (The
@@ -1024,11 +1022,6 @@ min_join_parameterization(PlannerInfo *root,
10241022
*/
10251023
result=bms_union(outer_rel->lateral_relids,inner_rel->lateral_relids);
10261024
result=bms_del_members(result,joinrelids);
1027-
1028-
/* Maintain invariant that result is exactly NULL if empty */
1029-
if (bms_is_empty(result))
1030-
result=NULL;
1031-
10321025
returnresult;
10331026
}
10341027

‎src/backend/rewrite/rewriteManip.c

Lines changed: 4 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -1247,16 +1247,11 @@ remove_nulling_relids_mutator(Node *node,
12471247
!bms_is_member(var->varno,context->except_relids)&&
12481248
bms_overlap(var->varnullingrels,context->removable_relids))
12491249
{
1250-
Relidsnewnullingrels=bms_difference(var->varnullingrels,
1251-
context->removable_relids);
1252-
1253-
/* Micro-optimization: ensure nullingrels is NULL if empty */
1254-
if (bms_is_empty(newnullingrels))
1255-
newnullingrels=NULL;
12561250
/* Copy the Var ... */
12571251
var=copyObject(var);
12581252
/* ... and replace the copy's varnullingrels field */
1259-
var->varnullingrels=newnullingrels;
1253+
var->varnullingrels=bms_difference(var->varnullingrels,
1254+
context->removable_relids);
12601255
return (Node*)var;
12611256
}
12621257
/* Otherwise fall through to copy the Var normally */
@@ -1268,26 +1263,20 @@ remove_nulling_relids_mutator(Node *node,
12681263
if (phv->phlevelsup==context->sublevels_up&&
12691264
!bms_overlap(phv->phrels,context->except_relids))
12701265
{
1271-
Relidsnewnullingrels=bms_difference(phv->phnullingrels,
1272-
context->removable_relids);
1273-
12741266
/*
1275-
* Micro-optimization: ensure nullingrels is NULL if empty.
1276-
*
12771267
* Note: it might seem desirable to remove the PHV altogether if
12781268
* phnullingrels goes to empty. Currently we dare not do that
12791269
* because we use PHVs in some cases to enforce separate identity
12801270
* of subexpressions; see wrap_non_vars usages in prepjointree.c.
12811271
*/
1282-
if (bms_is_empty(newnullingrels))
1283-
newnullingrels=NULL;
12841272
/* Copy the PlaceHolderVar and mutate what's below ... */
12851273
phv= (PlaceHolderVar*)
12861274
expression_tree_mutator(node,
12871275
remove_nulling_relids_mutator,
12881276
(void*)context);
12891277
/* ... and replace the copy's phnullingrels field */
1290-
phv->phnullingrels=newnullingrels;
1278+
phv->phnullingrels=bms_difference(phv->phnullingrels,
1279+
context->removable_relids);
12911280
/* We must also update phrels, if it contains a removable RTI */
12921281
phv->phrels=bms_difference(phv->phrels,
12931282
context->removable_relids);

‎src/pl/plpgsql/src/pl_exec.c

Lines changed: 2 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -6240,12 +6240,9 @@ setup_param_list(PLpgSQL_execstate *estate, PLpgSQL_expr *expr)
62406240
Assert(expr->plan!=NULL);
62416241

62426242
/*
6243-
* We only need a ParamListInfo if the expression has parameters. In
6244-
* principle we should test with bms_is_empty(), but we use a not-null
6245-
* test because it's faster. In current usage bits are never removed from
6246-
* expr->paramnos, only added, so this test is correct anyway.
6243+
* We only need a ParamListInfo if the expression has parameters.
62476244
*/
6248-
if (expr->paramnos)
6245+
if (!bms_is_empty(expr->paramnos))
62496246
{
62506247
/* Use the common ParamListInfo */
62516248
paramLI=estate->paramLI;

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