Movatterモバイル変換

[0]ホーム
URL:

Skip to content

Navigation Menu

Sign in
Appearance settings

Search code, repositories, users, issues, pull requests...

Provide feedback

We read every piece of feedback, and take your input very seriously.

Saved searches

Use saved searches to filter your results more quickly

 Sign up
Appearance settings

Commitc23e3e6

Browse files
committed
Use list_copy_head() instead of list_truncate(list_copy(...), ...)
Truncating off the end of a freshly copied List is not a very efficientway of copying the first N elements of a List.In many of the cases that are updated here, the pattern was only beingused to remove the final element of a List. That's about the best casefor it, but there were many instances where the truncate trimming the Listdown much further.4cc832f added list_copy_head(), so let's use it in cases where it'suseful.Author: David RowleyDiscussion:https://postgr.es/m/1986787.1657666922%40sss.pgh.pa.us
1 parent50e4c28 commitc23e3e6

File tree

7 files changed

+25
-30
lines changed

7 files changed

+25
-30
lines changed

‎src/backend/catalog/objectaddress.c‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -1453,7 +1453,7 @@ get_object_address_relobject(ObjectType objtype, List *object,
14531453
errmsg("must specify relation and object name")));
14541454

14551455
/* Extract relation name and open relation. */
1456-
relname=list_truncate(list_copy(object),nnames-1);
1456+
relname=list_copy_head(object,nnames-1);
14571457
relation=table_openrv_extended(makeRangeVarFromNameList(relname),
14581458
AccessShareLock,
14591459
missing_ok);
@@ -1528,7 +1528,7 @@ get_object_address_attribute(ObjectType objtype, List *object,
15281528
(errcode(ERRCODE_SYNTAX_ERROR),
15291529
errmsg("column name must be qualified")));
15301530
attname=strVal(llast(object));
1531-
relname=list_truncate(list_copy(object),list_length(object)-1);
1531+
relname=list_copy_head(object,list_length(object)-1);
15321532
/* XXX no missing_ok support here */
15331533
relation=relation_openrv(makeRangeVarFromNameList(relname),lockmode);
15341534
reloid=RelationGetRelid(relation);
@@ -1581,7 +1581,7 @@ get_object_address_attrdef(ObjectType objtype, List *object,
15811581
(errcode(ERRCODE_SYNTAX_ERROR),
15821582
errmsg("column name must be qualified")));
15831583
attname=strVal(llast(object));
1584-
relname=list_truncate(list_copy(object),list_length(object)-1);
1584+
relname=list_copy_head(object,list_length(object)-1);
15851585
/* XXX no missing_ok support here */
15861586
relation=relation_openrv(makeRangeVarFromNameList(relname),lockmode);
15871587
reloid=RelationGetRelid(relation);
@@ -1715,7 +1715,7 @@ get_object_address_opf_member(ObjectType objtype,
17151715
* address. The rest can be used directly by get_object_address_opcf().
17161716
*/
17171717
membernum=atoi(strVal(llast(linitial(object))));
1718-
copy=list_truncate(list_copy(linitial(object)),list_length(linitial(object))-1);
1718+
copy=list_copy_head(linitial(object),list_length(linitial(object))-1);
17191719

17201720
/* no missing_ok support here */
17211721
famaddr=get_object_address_opcf(OBJECT_OPFAMILY,copy, false);

‎src/backend/commands/dropcmds.c‎

Lines changed: 7 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -145,8 +145,7 @@ owningrel_does_not_exist_skipping(List *object, const char **msg, char **name)
145145
List*parent_object;
146146
RangeVar*parent_rel;
147147

148-
parent_object=list_truncate(list_copy(object),
149-
list_length(object)-1);
148+
parent_object=list_copy_head(object,list_length(object)-1);
150149

151150
if (schema_does_not_exist_skipping(parent_object,msg,name))
152151
return true;
@@ -419,17 +418,17 @@ does_not_exist_skipping(ObjectType objtype, Node *object)
419418
{
420419
msg=gettext_noop("trigger \"%s\" for relation \"%s\" does not exist, skipping");
421420
name=strVal(llast(castNode(List,object)));
422-
args=NameListToString(list_truncate(list_copy(castNode(List,object)),
423-
list_length(castNode(List,object))-1));
421+
args=NameListToString(list_copy_head(castNode(List,object),
422+
list_length(castNode(List,object))-1));
424423
}
425424
break;
426425
caseOBJECT_POLICY:
427426
if (!owningrel_does_not_exist_skipping(castNode(List,object),&msg,&name))
428427
{
429428
msg=gettext_noop("policy \"%s\" for relation \"%s\" does not exist, skipping");
430429
name=strVal(llast(castNode(List,object)));
431-
args=NameListToString(list_truncate(list_copy(castNode(List,object)),
432-
list_length(castNode(List,object))-1));
430+
args=NameListToString(list_copy_head(castNode(List,object),
431+
list_length(castNode(List,object))-1));
433432
}
434433
break;
435434
caseOBJECT_EVENT_TRIGGER:
@@ -441,8 +440,8 @@ does_not_exist_skipping(ObjectType objtype, Node *object)
441440
{
442441
msg=gettext_noop("rule \"%s\" for relation \"%s\" does not exist, skipping");
443442
name=strVal(llast(castNode(List,object)));
444-
args=NameListToString(list_truncate(list_copy(castNode(List,object)),
445-
list_length(castNode(List,object))-1));
443+
args=NameListToString(list_copy_head(castNode(List,object),
444+
list_length(castNode(List,object))-1));
446445
}
447446
break;
448447
caseOBJECT_FDW:

‎src/backend/commands/sequence.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1620,7 +1620,7 @@ process_owned_by(Relation seqrel, List *owned_by, bool for_identity)
16201620
RangeVar*rel;
16211621

16221622
/* Separate relname and attr name */
1623-
relname=list_truncate(list_copy(owned_by),nnames-1);
1623+
relname=list_copy_head(owned_by,nnames-1);
16241624
attrname=strVal(llast(owned_by));
16251625

16261626
/* Open and lock rel to ensure it won't go away meanwhile */

‎src/backend/optimizer/path/allpaths.c‎

Lines changed: 4 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -2053,9 +2053,8 @@ accumulate_append_subpath(Path *path, List **subpaths, List **special_subpaths)
20532053
*subpaths=list_concat(*subpaths,
20542054
list_copy_tail(apath->subpaths,
20552055
apath->first_partial_path));
2056-
new_special_subpaths=
2057-
list_truncate(list_copy(apath->subpaths),
2058-
apath->first_partial_path);
2056+
new_special_subpaths=list_copy_head(apath->subpaths,
2057+
apath->first_partial_path);
20592058
*special_subpaths=list_concat(*special_subpaths,
20602059
new_special_subpaths);
20612060
return;
@@ -3086,8 +3085,8 @@ get_useful_pathkeys_for_relation(PlannerInfo *root, RelOptInfo *rel,
30863085
root->query_pathkeys);
30873086
elseif (npathkeys>0)
30883087
useful_pathkeys_list=lappend(useful_pathkeys_list,
3089-
list_truncate(list_copy(root->query_pathkeys),
3090-
npathkeys));
3088+
list_copy_head(root->query_pathkeys,
3089+
npathkeys));
30913090
}
30923091

30933092
returnuseful_pathkeys_list;

‎src/backend/optimizer/path/indxpath.c‎

Lines changed: 6 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -3026,14 +3026,12 @@ expand_indexqual_rowcompare(PlannerInfo *root,
30263026

30273027
rc->rctype= (RowCompareType)op_strategy;
30283028
rc->opnos=new_ops;
3029-
rc->opfamilies=list_truncate(list_copy(clause->opfamilies),
3030-
matching_cols);
3031-
rc->inputcollids=list_truncate(list_copy(clause->inputcollids),
3032-
matching_cols);
3033-
rc->largs=list_truncate(copyObject(var_args),
3034-
matching_cols);
3035-
rc->rargs=list_truncate(copyObject(non_var_args),
3036-
matching_cols);
3029+
rc->opfamilies=list_copy_head(clause->opfamilies,
3030+
matching_cols);
3031+
rc->inputcollids=list_copy_head(clause->inputcollids,
3032+
matching_cols);
3033+
rc->largs=list_copy_head(var_args,matching_cols);
3034+
rc->rargs=list_copy_head(non_var_args,matching_cols);
30373035
iclause->indexquals=list_make1(make_simple_restrictinfo(root,
30383036
(Expr*)rc));
30393037
}

‎src/backend/optimizer/path/pathkeys.c‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2464,7 +2464,7 @@ truncate_useless_pathkeys(PlannerInfo *root,
24642464
elseif (nuseful==list_length(pathkeys))
24652465
returnpathkeys;
24662466
else
2467-
returnlist_truncate(list_copy(pathkeys),nuseful);
2467+
returnlist_copy_head(pathkeys,nuseful);
24682468
}
24692469

24702470
/*

‎src/backend/optimizer/plan/createplan.c‎

Lines changed: 2 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1397,8 +1397,7 @@ create_append_plan(PlannerInfo *root, AppendPath *best_path, int flags)
13971397
*/
13981398
if (tlist_was_changed&& (flags& (CP_EXACT_TLIST |CP_SMALL_TLIST)))
13991399
{
1400-
tlist=list_truncate(list_copy(plan->plan.targetlist),
1401-
orig_tlist_length);
1400+
tlist=list_copy_head(plan->plan.targetlist,orig_tlist_length);
14021401
returninject_projection_plan((Plan*)plan,tlist,
14031402
plan->plan.parallel_safe);
14041403
}
@@ -1557,7 +1556,7 @@ create_merge_append_plan(PlannerInfo *root, MergeAppendPath *best_path,
15571556
*/
15581557
if (tlist_was_changed&& (flags& (CP_EXACT_TLIST |CP_SMALL_TLIST)))
15591558
{
1560-
tlist=list_truncate(list_copy(plan->targetlist),orig_tlist_length);
1559+
tlist=list_copy_head(plan->targetlist,orig_tlist_length);
15611560
returninject_projection_plan(plan,tlist,plan->parallel_safe);
15621561
}
15631562
else

0 commit comments

Comments
 (0)
[8]ページ先頭
©2009-2025 Movatter.jp