database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-31 22:04:40 +03:00
Code Activity

Improve possible performance regression

Browse Source 
Commit ce62f2f2a0 introduced calls to GetIndexAmRoutineByAmId() in
lsyscache.c functions.  This call is a bit more expensive than a
simple syscache lookup.  So rearrange the nesting so that we call that
one last and do the cheaper checks first.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://www.postgresql.org/message-id/flat/E1tngY6-0000UL-2n%40gemulon.postgresql.org
This commit is contained in:
Peter Eisentraut
2025-03-07 11:20:26 +01:00
parent af4002b381
commit 7f24c02743
1 changed files with 16 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/backend/utils/cache/lsyscache.c vendored
View File

@ -717,11 +717,16 @@ equality_ops_are_compatible(Oid opno1, Oid opno2)
{
HeapTuple op_tuple = &catlist->members[i]->tuple;
Form_pg_amop op_form = (Form_pg_amop) GETSTRUCT(op_tuple);
/*
* op_in_opfamily() is cheaper than GetIndexAmRoutineByAmId(), so
* check it first
*/
if (op_in_opfamily(opno2, op_form->amopfamily))
{
IndexAmRoutine *amroutine = GetIndexAmRoutineByAmId(op_form->amopmethod, false);
if (amroutine->amconsistentequality)
{
if (op_in_opfamily(opno2, op_form->amopfamily))
{
result = true;
break;
@ -768,11 +773,16 @@ comparison_ops_are_compatible(Oid opno1, Oid opno2)
{
HeapTuple op_tuple = &catlist->members[i]->tuple;
Form_pg_amop op_form = (Form_pg_amop) GETSTRUCT(op_tuple);
/*
* op_in_opfamily() is cheaper than GetIndexAmRoutineByAmId(), so
* check it first
*/
if (op_in_opfamily(opno2, op_form->amopfamily))
{
IndexAmRoutine *amroutine = GetIndexAmRoutineByAmId(op_form->amopmethod, false);
if (amroutine->amcanorder && amroutine->amconsistentordering)
{
if (op_in_opfamily(opno2, op_form->amopfamily))
{
result = true;
break;